Not allowed empty primary values

[Linary]

Change-Id: I6b7502892383d08348734502d0e59f5d94128fc7

[codecov]

Codecov Report

Merging #847 into master will decrease coverage by 15.48%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             master     #847       +/-   ##
=============================================
- Coverage     71.16%   55.68%   -15.49%     
+ Complexity     4358     3368      -990     
=============================================
  Files           283      283               
  Lines         20967    20968        +1     
  Branches       2959     2960        +1     
=============================================
- Hits          14921    11675     -3246     
- Misses         4566     7975     +3409     
+ Partials       1480     1318      -162

Impacted Files	Coverage Δ	Complexity Δ
...java/com/baidu/hugegraph/structure/HugeVertex.java	76.62% <100%> (-2.08%)	66 <0> (-9)
.../backend/store/scylladb/ScyllaDBStoreProvider.java	0% <0%> (-100%)	0% <0%> (-7%)
...graph/backend/store/scylladb/ScyllaDBFeatures.java	0% <0%> (-100%)	0% <0%> (-3%)
...ackend/store/cassandra/CassandraStoreProvider.java	0% <0%> (-100%)	0% <0%> (-6%)
...va/com/baidu/hugegraph/io/HugeGraphIoRegistry.java	0% <0%> (-100%)	0% <0%> (-4%)
...aidu/hugegraph/exception/HugeGremlinException.java	0% <0%> (-100%)	0% <0%> (-3%)
...h/backend/store/scylladb/ScyllaDBTablesWithMV.java	0% <0%> (-96.04%)	0% <0%> (-10%)
...ava/com/baidu/hugegraph/analyzer/WordAnalyzer.java	0% <0%> (-92.31%)	0% <0%> (-4%)
...h/backend/store/cassandra/CassandraSerializer.java	0% <0%> (-90.48%)	0% <0%> (-27%)
...aph/backend/serializer/BinaryInlineSerializer.java	0% <0%> (-90.33%)	0% <0%> (-10%)
... and 114 more

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[javeme]

The value of primary key can't be empty