fix(android): nonNull getPosition

[m1ga]

I was searching the code what could cause this error

java.lang.NullPointerException: Attempt to invoke virtual method 'int com.google.android.gms.maps.model.LatLng.hashCode()' on a null object reference
       at com.google.maps.android.clustering.algo.StaticCluster.hashCode(StaticCluster.java:71)
       at java.util.HashMap.hash(HashMap.java:336)
       at java.util.HashMap.put(HashMap.java:608)
       at java.util.HashSet.add(HashSet.java:220)
       at com.google.maps.android.clustering.algo.NonHierarchicalDistanceBasedAlgorithm.getClusters(NonHierarchicalDistanceBasedAlgorithm.java:201)
       at com.google.maps.android.clustering.algo.PreCachingAlgorithmDecorator.getClustersInternal(PreCachingAlgorithmDecorator.java:141)
       at com.google.maps.android.clustering.algo.PreCachingAlgorithmDecorator.access$000(PreCachingAlgorithmDecorator.java:34)
       at com.google.maps.android.clustering.algo.PreCachingAlgorithmDecorator$PrecacheRunnable.run(PreCachingAlgorithmDecorator.java:164)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
       at java.lang.Thread.run(Thread.java:1012)

and I found one place in our ClusterRenderer in getPositiom() that could return null for a cluster. BUT with Android Studio I saw that it actually is marked as @NonNull. So I've added that in our override and in rare cases where it was returning null before (when the proxy is gone already but it still tries to create a cluster) it now returns LatLng(0,0). From my understanding that should only be the case when you e.g. close a window and it is clustering items and they are being removed.

Also added another null check for tiMarker before adding a cluster item.

I've tested it with annotations at position 0,0 and they are displayed and also clustered. So in a rare case when you want to add something at 0,0 it still is displayed 😄

I couldn't verify if this fixes that error because it happens very very rarely. But using this for a couple of days now and no crash so far 🤞

ti.map-android-5.6.2.zip