SpanEventFactory - adding null check on server port

[meiao]

Overview

SpanEventFactory#setServerPort received an int, but the methods that provided this int returned an Integer.
A case was found where the port received was null and caused an NPE.
Adding a null check to prevent it.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.70%. Comparing base (d1111df) to head (6e293c6).

Files with missing lines	Patch %	Lines
...elic/agent/service/analytics/SpanEventFactory.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2127   +/-   ##
=========================================
  Coverage     70.69%   70.70%           
- Complexity     9983     9986    +3     
=========================================
  Files           841      841           
  Lines         40289    40290    +1     
  Branches       6107     6107           
=========================================
+ Hits          28484    28487    +3     
  Misses         9062     9062           
+ Partials       2743     2741    -2     

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