Fixed NPE warnings

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 61.28%. Comparing base (d754510) to head (b58d8a0).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...n/java/tech/ydb/coordination/impl/SessionImpl.java	0.00%	1 Missing ⚠️
...ain/java/tech/ydb/core/impl/BaseGrpcTransport.java	0.00%	1 Missing ⚠️
...java/tech/ydb/query/tools/SessionRetryContext.java	0.00%	1 Missing ⚠️
.../main/java/tech/ydb/table/SessionRetryContext.java	0.00%	1 Missing ⚠️
...src/main/java/tech/ydb/table/impl/BaseSession.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #515   +/-   ##
=========================================
  Coverage     61.27%   61.28%           
- Complexity     2306     2307    +1     
=========================================
  Files           328      328           
  Lines         13445    13445           
  Branches       1343     1343           
=========================================
+ Hits           8239     8240    +1     
+ Misses         4572     4571    -1     
  Partials        634      634           

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