Check if TDSCommand counter is null before incrementing.

[Jeffery-Wasty]

Prevents #2353.

[codecov]

Codecov Report

Attention: Patch coverage is 78.37838% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 50.09%. Comparing base (7e0dcb3) to head (4716d69).
Report is 3 commits behind head on main.

❗ Current head 4716d69 differs from pull request most recent head 5b94ee5. Consider uploading reports for the commit 5b94ee5 to get more accurate results

Files	Patch %	Lines
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	33.33%	3 Missing and 1 partial ⚠️
...oft/sqlserver/jdbc/SQLServerBulkCSVFileRecord.java	80.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2368   +/-   ##
=========================================
  Coverage     50.09%   50.09%           
- Complexity     3814     3823    +9     
=========================================
  Files           145      145           
  Lines         33291    33324   +33     
  Branches       5639     5649   +10     
=========================================
+ Hits          16677    16694   +17     
- Misses        14226    14238   +12     
- Partials       2388     2392    +4     

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