improve: close tx if GraphTransaction is error

[coderzc]

No description provided.

[codecov]

Codecov Report

Merging #1655 (e434e72) into master (2dcfbfa) will increase coverage by 0.77%.
The diff coverage is 52.94%.

@@             Coverage Diff              @@
##             master    #1655      +/-   ##
============================================
+ Coverage     66.18%   66.95%   +0.77%     
- Complexity     7018     7066      +48     
============================================
  Files           421      421              
  Lines         34655    34670      +15     
  Branches       4798     4801       +3     
============================================
+ Hits          22935    23214     +279     
+ Misses         9383     9110     -273     
- Partials       2337     2346       +9     

Impacted Files	Coverage Δ
...in/java/com/baidu/hugegraph/StandardHugeGraph.java	68.72% <52.94%> (-0.62%)	⬇️
...va/com/baidu/hugegraph/task/ServerInfoManager.java	71.34% <0.00%> (-2.81%)	⬇️
...ain/java/com/baidu/hugegraph/task/TaskManager.java	69.06% <0.00%> (-1.44%)	⬇️
.../baidu/hugegraph/backend/query/ConditionQuery.java	86.11% <0.00%> (+0.27%)	⬆️
...c/main/java/com/baidu/hugegraph/task/HugeTask.java	72.30% <0.00%> (+0.30%)	⬆️
...egraph/backend/store/cassandra/CassandraStore.java	72.64% <0.00%> (+0.85%)	⬆️
.../backend/store/cassandra/CassandraSessionPool.java	57.14% <0.00%> (+1.02%)	⬆️
.../java/com/baidu/hugegraph/auth/RolePermission.java	91.76% <0.00%> (+1.17%)	⬆️
...in/java/com/baidu/hugegraph/auth/HugeResource.java	79.22% <0.00%> (+1.29%)	⬆️
...egraph/backend/store/cassandra/CassandraShard.java	52.77% <0.00%> (+1.85%)	⬆️
... and 10 more

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