Crash on iOS 7.1

Start with FDStackViewDistributionLayoutArrangement.m at line 226 and reproduce the reported case: an FDStackView added in a storyboard controller that is dismissed in code on iOS 7.1. Inspect the constraint-removal path and use the supplied console output to identify why the crash occurs. Done means dismissing the controller no longer crashes on the reported configuration.

在Storyboard的一个Controller里添加了FDStackView，用代码dismiss该controller时崩溃在FDStackViewDistributionLayoutArrangement.m第226行：[self.canvas removeConstraints:self.relatedDimensionConstraints.fd_allObjects];
控制台输出：
Objective: {objective 0x178839a40: <999:-18.4039, 998:-342.146, 997:25.7032, 996:-0.509864, 750:826, 251:789, 25:1248> + <750:1, 251:1>_0x1708ad740.negError{id: 1554} + <750:1, 251:1>_0x1708ad7a0.negError{id: 1558} + <750:1, 251:1>_0x1708ad800.negError{id: 1560} + <750:1, 251:1>_0x1708ad8c0.posErrorMarker{id: 1561} + <750:1, 251:1>_0x1708ad920.posErrorMarker{id: 1563} + 750:1_0x1708ad980.negError{id: 1574} + <750:-6.44498e-07, 251:1>_0x1708ad980.posErrorMarker{id: 1573} + <750:1, 25:-2>_0x1708ad9e0.negError{id: 1576} + <251:1, 25:2>_0x1708ad9e0.posErrorMarker{id: 1575} + <750:1, 251:1>_0x1708adb60.negError{id: 1632} + <750:1, 251:1>_0x1708adbc0.negError{id: 1634} + <750:1, 251:1>_0x1708adc20.negError{id: 1636} + <750:1, 251:1>_0x1708adc80.negError{id: 1638} + <750:-2, 251:4>_0x171280320.marker{id: 1262} + <750:-2, 251:4>_0x171280780.marker{id: 1274} + 251:1_0x17128c990.marker{id: 1470} + 51:2_0x17128d3e0:FDSV-spanning-fit.negError{id: 1387} + 999.5:2_0x17128d430:FDSV-spanning-boundary.posErrorMarker{id: 1389} + 999.5:1_0x17128d480:FDSV-spanning-boundary.error{id: 1394} + 999.5:1_0x17128d4d0:FDSV-spanning-boundary.negError{id: 1397} + 999.5:1_0x17128d4d0:FDSV-spanning-boundary.posErrorMarker{id: 1396} + 999.5:1_0x17128d520:FDSV-spanning-boundary.error{id: 1400} + 999.5:2_0x17128d570:FDSV-spanning-boundary.negError{id: 1402} + 999.5:1_0x17128d5c0:FDSV-spanning-boundary.error{id: 1405} + 251:1_0x17128d610.marker{id: 1316} + 999.5:2_0x17128d660:FDSV-spanning-boundary.posErrorMarker{id: 1406} + 251:1_0x17128d930.marker{id: 1318} + 750:-1_0x17128db60.marker{id: 1320} + 251:-1_0x17128dc50.marker{id: 1428} + 251:-1_0x17128dcf0.marker{id: 1434} + 251:-1_0x17128dd90.marker{id: 1439} + 251:-1_0x17128dde0.marker{id: 1441} + 750:0_0x17128de80.marker{id: 1445} + 750:0_0x17128ded0.marker{id: 1447} + 750:1_0x17128df20.marker{id: 1450} + 750:1_0x17128dfc0.marker{id: 1455} + 251:1_0x17128e1f0.marker{id: 1474} + 251:1_0x17128e240.marker{id: 1476} + <750:1, 251:-2>_0x17128e2e0.marker{id: 1478} + <750:1, 251:-2>_0x17128e330.marker{id: 1481} + 750:0_0x1712940a0:FDSV-fill-proportionally.negError{id: 1606} + 750:0_0x171294280:FDSV-fill-proportionally.negError{id: 1610} + 25:2_0x1712946e0:FDSV-ambiguity-suppression.negError{id: 1620} + 25:2_0x1712948c0:FDSV-ambiguity-suppression.negError{id: 1623} + 999.5:1_0x1712949b0:FDSV-alignment.marker{id: 1624} + 25:2_0x171294aa0:FDSV-ambiguity-suppression.negError{id: 1626} + 999.5:-1_0x171294b90:FDSV-alignment.marker{id: 1627} + 25:2_0x171294c80:FDSV-ambiguity-suppression.negError{id: 1629} + 999.5:1_0x171294d70:FDSV-alignment.marker{id: 1630} + <750:-1, 251:2>_0x178a86f90.marker{id: 112} + 999:2_0x178aab760.negError{id: 1507} + 999:2_0x178aab7c0.negError{id: 1510} + <750:1, 251:1>_0x178aac6c0.negError{id: 1556} + 750:1_0x178aac720.negError{id: 1566} + 250:1_0x178aac720.posErrorMarker{id: 1565} + 750:1_0x178aac780.negError{id: 1568} + 250:1_0x178aac780.posErrorMarker{id: 1567} + 750:1_0x178aac8a0.negError{id: 1578} + 250:1_0x178aac8a0.posErrorMarker{id: 1577} + 750:1_0x178aac900.negError{id: 1580} + 250:1_0x178aac900.posErrorMarker{id: 1579} + 750:1_0x178aac960.negError{id: 1582} + 251:1_0x178aac960.posErrorMarker{id: 1581} + <750:1, 25:-2>_0x178aac9c0.negError{id: 1584} + <251:1, 25:2>_0x178aac9c0.posErrorMarker{id: 1583} + 750:1_0x178aaca20.negError{id: 1586} + <750:0, 251:1>_0x178aaca20.posErrorMarker{id: 1585} + <750:1, 25:-2>_0x178aaca80.negError{id: 1588} + <251:1, 25:2>_0x178aaca80.posErrorMarker{id: 1587} + 750:1_0x178aacae0.negError{id: 1590} + 250:1_0x178aacae0.posErrorMarker{id: 1589} + 750:1_0x178aacb40.negError{id: 1592} + 250:1_0x178aacb40.posErrorMarker{id: 1591} + 750:1_0x178aacba0.negError{id: 1594} + <750:0, 251:1>0x178aacba0.posErrorMarker{id: 1593} + <750:1, 25:-2>0x178aacc00.negError{id: 1596} + <251:1, 25:2>0x178aacc00.posErrorMarker{id: 1595} + <750:-2, 251:4>0x179283020.marker{id: 1305} + 251:1_0x179289650.marker{id: 1473} + 999.5:1_0x179289dd0:FDSV-spanning-boundary.error{id: 1410} + 999.5:2_0x179289e20:FDSV-spanning-boundary.negError{id: 1412} + 999.5:1_0x179289e70:FDSV-spanning-boundary.error{id: 1415} + 25:2_0x179289fb0:FDSV-ambiguity-suppression.negError{id: 1337} + 25:2_0x17928a050:FDSV-ambiguity-suppression.negError{id: 1340} + 25:2_0x17928a0f0:FDSV-ambiguity-suppression.negError{id: 1350} + 25:2_0x17928a190:FDSV-ambiguity-suppression.negError{id: 1353} + <750:-1, 251:2>0x17928a5a0.marker{id: 1519} + 750:0_0x179290680:FDSV-canvas-connection.marker{id: 1597} + 750:0_0x1792906d0.marker{id: 1598} + <750:-2, 251:4>0x1792920c0.marker{id: 1688} + 750:0<orphaned without delegate (bug!):0x178a27620>{id: 148} + 750:0<orphaned without delegate (bug!):0x178a27ce0>{id: 179} + 750:0<orphaned without delegate (bug!):0x178a27e40>{id: 186} + 750:6.37025e-07<orphaned without delegate (bug!):0x178a27e60>{id: 187} + 750:0<orphaned without delegate (bug!):0x178a2aca0>{id: 420} + 750:0<orphaned without delegate (bug!):0x178a2ade0>{id: 424} + 51:1_FDLayoutSpacer:0x178588470.Width{id: 1388} + 750:0_UIImageView:0x1703eb600.Width{id: 1334} + 750:0_UIImageView:0x1703eba00.minX{id: 1370} + 750:0_UIImageView:0x1783ecc00.minX{id: 1372} + 750:0_UIImageView:0x1783ecf00.minX{id: 1375} + 999:1__UILayoutGuide:0x178588540.Width{id: 1508} + 999:1*_UILayoutGuide:0x178588610.Width{id: 1511}}