fix NoSuchElementException of shortest path

[zhoney]

Change-Id: I9c645d09c9bdd589be1fa381b7264f9e997d1f41

[codecov]

Codecov Report

Merging #1116 into master will decrease coverage by 4.46%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1116      +/-   ##
============================================
- Coverage     66.43%   61.96%   -4.47%     
+ Complexity     5646     5349     -297     
============================================
  Files           347      347              
  Lines         28521    28521              
  Branches       4028     4028              
============================================
- Hits          18947    17674    -1273     
- Misses         7716     9056    +1340     
+ Partials       1858     1791      -67     

Impacted Files	Coverage Δ	Complexity Δ
...egraph/backend/store/mysql/MysqlStoreProvider.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-6.00%)
...raph/backend/store/postgresql/PostgresqlStore.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...raph/backend/store/postgresql/PostgresqlTable.java	0.00% <0.00%> (-96.83%)	0.00% <0.00%> (-19.00%)
...kend/store/postgresql/PostgresqlStoreProvider.java	0.00% <0.00%> (-92.50%)	0.00% <0.00%> (-5.00%)
...idu/hugegraph/backend/store/mysql/MysqlTables.java	0.00% <0.00%> (-89.61%)	0.00% <0.00%> (-1.00%)
...aph/backend/store/postgresql/PostgresqlTables.java	0.00% <0.00%> (-87.96%)	0.00% <0.00%> (-1.00%)
...hugegraph/backend/store/mysql/MysqlSerializer.java	0.00% <0.00%> (-82.46%)	0.00% <0.00%> (-19.00%)
...aidu/hugegraph/backend/store/mysql/MysqlStore.java	0.00% <0.00%> (-81.73%)	0.00% <0.00%> (-45.00%)
...aidu/hugegraph/backend/store/mysql/MysqlTable.java	0.00% <0.00%> (-81.55%)	0.00% <0.00%> (-96.00%)
...egraph/backend/store/mysql/MysqlEntryIterator.java	0.00% <0.00%> (-80.25%)	0.00% <0.00%> (-21.00%)
... and 15 more

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