Fixed NPE in DataQueryResults::getQueryStats

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 62.96%. Comparing base (3fd06dd) to head (2fdc45b).

Files with missing lines	Patch %	Lines
...ain/java/tech/ydb/table/query/DataQueryResult.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #558      +/-   ##
============================================
+ Coverage     62.86%   62.96%   +0.10%     
- Complexity     2443     2445       +2     
============================================
  Files           332      332              
  Lines         13969    13969              
  Branches       1409     1409              
============================================
+ Hits           8782     8796      +14     
+ Misses         4541     4528      -13     
+ Partials        646      645       -1     

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