Enforce non-null coordinates on multimodal station

[vpaturet]

Summary

When querying a multimodal station without coordinates through the GraphQL API, the call fails with a NullPointerException:

Exception while fetching data (/trip/tripPatterns[0]/legs[5]/intermediateEstimatedCalls[7]/quay/stopPlace) : Cannot invoke "org.opentripplanner.framework.geometry.WgsCoordinate.latitude()" because the return value of "org.opentripplanner.transit.model.site.StopLocationsGroup.getCoordinate()" is null
java.lang.NullPointerException: Cannot invoke "org.opentripplanner.framework.geometry.WgsCoordinate.latitude()" because the return value of "org.opentripplanner.transit.model.site.StopLocationsGroup.getCoordinate()" is null
	at org.opentripplanner.transit.model.site.StopLocationsGroup.getLat(StopLocationsGroup.java:25)
	at org.opentripplanner.apis.transmodel.model.stop.MonoOrMultiModalStation.<init>(MonoOrMultiModalStation.java:59)
	at org.opentripplanner.apis.transmodel.model.stop.MonoOrMultiModalStation.<init>(MonoOrMultiModalStation.java:53)
	at org.opentripplanner.apis.transmodel.model.stop.QuayType.lambda$create$4(QuayType.java:125)

This PR ensures that multimodal stations without coordinates are ignored during graph building.

Issue

No

Unit tests

Updated unit tests

Documentation

No

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.64%. Comparing base (499fb93) to head (e58ff95).

Files	Patch %	Lines
...org/opentripplanner/netex/mapping/NetexMapper.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #5971   +/-   ##
==========================================
  Coverage      69.63%   69.64%           
- Complexity     17129    17134    +5     
==========================================
  Files           1937     1937           
  Lines          73741    73743    +2     
  Branches        7546     7547    +1     
==========================================
+ Hits           51350    51357    +7     
+ Misses         19754    19752    -2     
+ Partials        2637     2634    -3     

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