[Bug] Wrong result for where(count().is(lt(0))) when counted traversal is empty

Start by reproducing the minimal graph and query g.V('a').where(__.both('R').count().is(lt(0))).values('i') against the stated HugeGraph 1.7.0 environment. Trace the where() child traversal behavior for an empty both('R') result and add coverage for this case; done means the query returns [] rather than `[1]].

Bug Type (问题类型)

gremlin (结果不合预期)

Before submit

• 我已经确认现有的 Issues 与 FAQ 中没有相同 / 重复问题 (I have confirmed and searched that there are no similar problems in the historical issue and documents)

Environment (环境信息)

• Server Version: 1.7.0
• gremlin: 3.5.1
• Docker Image: hugegraph/hugegraph:latest
• Backend: default Docker standalone backend
• Data Size: 1 vertex, 0 edges

Expected & Actual behavior (期望与实际表现)

HugeGraph keeps a traverser for a where() child traversal whose count() is 0 and whose predicate is lt(0).

Minimal graph:
(a:A {i: 1})

No R edges exist.

Bug-triggering query:
g.V('a').where(__.both('R').count().is(lt(0))).values('i')

Expected:
[]

Actual:
[1]

Since the counted traversal returns 0, the predicate lt(0) should be false.

Vertex/Edge example (问题点 / 边数据举例)

**Vertex/Edge example**



curl -fsS --compressed -X DELETE \
  "http://127.0.0.1:8080/graphs/hugegraph/clear?confirm_message=I'm%20sure%20to%20delete%20all%20data"

curl -fsS --compressed -H 'Content-Type: application/json' -X POST \
  -d '{"id":"a","label":"A","properties":{"i":1}}' \
  "http://127.0.0.1:8080/graphs/hugegraph/graph/vertices"

Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)

**Schema**



curl -fsS --compressed -H 'Content-Type: application/json' -X POST \
  -d '{"name":"i","data_type":"LONG","cardinality":"SINGLE"}' \
  "http://127.0.0.1:8080/graphs/hugegraph/schema/propertykeys"

curl -fsS --compressed -H 'Content-Type: application/json' -X POST \
  -d '{"name":"A","id_strategy":"CUSTOMIZE_STRING","properties":["i"],"nullable_keys":["i"],"enable_label_index":true}' \
  "http://127.0.0.1:8080/graphs/hugegraph/schema/vertexlabels"

curl -fsS --compressed -H 'Content-Type: application/json' -X POST \
  -d '{"name":"B","id_strategy":"CUSTOMIZE_STRING","properties":[],"nullable_keys":[],"enable_label_index":true}' \
  "http://127.0.0.1:8080/graphs/hugegraph/schema/vertexlabels"

curl -fsS --compressed -H 'Content-Type: application/json' -X POST \
  -d '{"name":"R","source_label":"B","target_label":"A","frequency":"SINGLE","properties":[],"nullable_keys":[],"enable_label_index":true}' \
  "http://127.0.0.1:8080/graphs/hugegraph/schema/edgelabels"