Bug: board in a private channel is not shown

Steps to reproduce the behavior

1. Have a board Invoice in the private channel Admin
2. Go to the list of boards
3. Toggle the button Show empty (should be off, so that empty ones are not shown)
4. See that the board Invoice is not shown

Expected behavior

All boards, including the ones in private channels, should be shown

Edition and Platform

• Edition: Windows 10 / Server 6.0.1 / Desktop client v5
• Board 0.9.3 beta