Fixed NPE warnings

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 79.80%. Comparing base (52c769a) to head (7788229).

Files with missing lines	Patch %	Lines
...main/java/tech/ydb/jdbc/impl/BaseYdbResultSet.java	0.00%	0 Missing and 3 partials ⚠️
...rc/main/java/tech/ydb/jdbc/context/YdbContext.java	60.00%	0 Missing and 2 partials ⚠️
.../java/tech/ydb/jdbc/query/params/BatchedQuery.java	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #127      +/-   ##
============================================
- Coverage     79.86%   79.80%   -0.07%     
  Complexity     2338     2338              
============================================
  Files            68       68              
  Lines          6398     6401       +3     
  Branches        818      820       +2     
============================================
- Hits           5110     5108       -2     
- Misses          927      928       +1     
- Partials        361      365       +4     

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