Null Dimensions Cause Native Errors

[Moe-Baker]

On Android, setting a dimension to null will not cause an error within the Unity console, but it will cause native issues with the GA plugin.

Error/GameAnalytics: Error on GA thread
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
	at com.gameanalytics.sdk.events.GAEvents.addDimensionsToEvent(GAEvents.java:1320)
	at com.gameanalytics.sdk.events.GAEvents.addDesignEvent(GAEvents.java:1065)
	at com.gameanalytics.sdk.GameAnalytics$24.execute(GameAnalytics.java:1294)
	at com.gameanalytics.sdk.threading.GAThreading$1.run(GAThreading.java:32)
	at java.util.TimerThread.mainLoop(Timer.java:634)
	at java.util.TimerThread.run(Timer.java:577)

Now this isn't exactly an issue, but one might mistakenly think that setting a dimension to null will clear that dimension, and then one might not notice any issues in development builds as the error is reported within ADB, not as a Unity error, wherein one might spend hours trying to hunt the reason his analytics are mis-reporting (ask me how I know).

Here is some sample code:
Bad Code: SDK.SetCustomDimension01(first ? "first_session" : null);
Good Code: SDK.SetCustomDimension01(first ? "first_session" : "regular_session");

I'm not sure how the dimension system actually works, and how one can "remove" a dimension, but this whole null not giving any Unity errors seems like it would cause problems for various people, especially considering that the Game Analytics website indicates that null is a valid value for a dimension

[Moe-Baker]

Scratch that last point about "hinting at null being a viable value", it's outright mentioned within the documentation:
"The dimension value is reset by calling with null"
https://docs.gameanalytics.com/advanced-tracking/custom-dimensions