fix not rollback if commitPartOfEdgeDeletions() fails

[javeme]

Change-Id: Ic7b03c25fc00605980d461245b5d3c4b911a7d86

[codecov]

Codecov Report

Merging #1513 (b9a7866) into master (0c51de5) will decrease coverage by 1.00%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1513      +/-   ##
============================================
- Coverage     60.02%   59.01%   -1.01%     
- Complexity      305     6091    +5786     
============================================
  Files           426      406      -20     
  Lines         35096    33065    -2031     
  Branches       4970     4573     -397     
============================================
- Hits          21065    19513    -1552     
+ Misses        11894    11495     -399     
+ Partials       2137     2057      -80     

Impacted Files	Coverage Δ
...aidu/hugegraph/backend/tx/AbstractTransaction.java	70.06% <0.00%> (-2.84%)	⬇️
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	79.84% <0.00%> (-0.18%)	⬇️
...raph/backend/store/postgresql/PostgresqlStore.java	0.00% <0.00%> (-100.00%)	⬇️
...raph/backend/store/postgresql/PostgresqlTable.java	0.00% <0.00%> (-96.83%)	⬇️
...kend/store/postgresql/PostgresqlStoreProvider.java	0.00% <0.00%> (-92.50%)	⬇️
...aph/backend/store/postgresql/PostgresqlTables.java	0.00% <0.00%> (-87.96%)	⬇️
...raph/backend/store/cassandra/CassandraMetrics.java	0.00% <0.00%> (-86.96%)	⬇️
...du/hugegraph/backend/store/hbase/HbaseMetrics.java	0.00% <0.00%> (-86.85%)	⬇️
...ugegraph/backend/store/rocksdb/RocksDBMetrics.java	0.00% <0.00%> (-85.87%)	⬇️
...hugegraph/backend/store/mysql/MysqlSerializer.java	0.00% <0.00%> (-82.46%)	⬇️
... and 51 more

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