[#11854] Backport: fix possible NPE in ServerTransportFilter

[kojandy]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 37.08%. Comparing base (8badbdd) to head (dea5731).
Report is 2 commits behind head on 3.0.x.

Files with missing lines	Patch %	Lines
...c/server/ConnectionCountServerTransportFilter.java	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##              3.0.x   #11862   +/-   ##
=========================================
  Coverage     37.07%   37.08%           
- Complexity    12293    12295    +2     
=========================================
  Files          4049     4049           
  Lines         99367    99369    +2     
  Branches      10472    10472           
=========================================
+ Hits          36843    36853   +10     
+ Misses        59532    59523    -9     
- Partials       2992     2993    +1     

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