StringEncoding: improve empty bytes decode

[javeme]

Change-Id: I6649c70ef63305acb9eada4abf307a099cf4a997

[github-actions]

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[javeme]

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[codecov]

Codecov Report

Merging #1788 (c663887) into master (035a03e) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             master    #1788    +/-   ##
==========================================
  Coverage     70.92%   70.92%            
+ Complexity      980      693   -287     
==========================================
  Files           446      446            
  Lines         37883    37894    +11     
  Branches       5397     5398     +1     
==========================================
+ Hits          26867    26876     +9     
+ Misses         8289     8285     -4     
- Partials       2727     2733     +6     

Impacted Files	Coverage Δ
...idu/hugegraph/backend/store/hbase/HbaseTables.java	88.42% <ø> (ø)
...hugegraph/backend/serializer/BinarySerializer.java	85.71% <36.36%> (-0.39%)	⬇️
...aidu/hugegraph/backend/serializer/BytesBuffer.java	89.18% <80.00%> (+0.07%)	⬆️
...gegraph/backend/serializer/BinaryBackendEntry.java	79.77% <100.00%> (-0.23%)	⬇️
...java/com/baidu/hugegraph/structure/HugeVertex.java	79.15% <100.00%> (-0.21%)	⬇️
.../java/com/baidu/hugegraph/util/StringEncoding.java	85.91% <100.00%> (+0.84%)	⬆️
...om/baidu/hugegraph/api/filter/ExceptionFilter.java	56.73% <0.00%> (-1.93%)	⬇️
...va/com/baidu/hugegraph/util/collection/IntSet.java	73.61% <0.00%> (-1.28%)	⬇️
...va/com/baidu/hugegraph/task/ServerInfoManager.java	77.95% <0.00%> (-0.54%)	⬇️
... and 3 more

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