Fixed possibly NPE

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 79.80%. Comparing base (4063fce) to head (5e3e4fb).
⚠️ Report is 113 commits behind head on master.

Files with missing lines	Patch %	Lines
...main/java/tech/ydb/jdbc/impl/BaseYdbResultSet.java	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #128   +/-   ##
=========================================
  Coverage     79.80%   79.80%           
  Complexity     2338     2338           
=========================================
  Files            68       68           
  Lines          6401     6401           
  Branches        820      820           
=========================================
  Hits           5108     5108           
  Misses          928      928           
  Partials        365      365           

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