fix: null pointer exception in ClusterRenderer when continuously updating cluster item values

maps-compose-utils/src/main/java/com/google/maps/android/compose/clustering/ClusterRenderer.kt

@@ -168,26 +168,35 @@ internal class ComposeUiClusterRenderer<T : ClusterItem>(
         }
     }
 
-    private fun renderViewToBitmapDescriptor(view: AbstractComposeView): BitmapDescriptor {
+    private fun renderViewToBitmapDescriptor(view: AbstractComposeView?): BitmapDescriptor {
         /* AndroidComposeView triggers LayoutNode's layout phase in the View draw phase,
            so trigger a draw to an empty canvas to force that */
-        view.draw(fakeCanvas)
-        val viewParent = (view.parent as ViewGroup)
-        view.measure(
-            View.MeasureSpec.makeMeasureSpec(viewParent.width, View.MeasureSpec.AT_MOST),
-            View.MeasureSpec.makeMeasureSpec(viewParent.height, View.MeasureSpec.AT_MOST),
-        )
-        view.layout(0, 0, view.measuredWidth, view.measuredHeight)
-        val bitmap = Bitmap.createBitmap(
-            view.measuredWidth.takeIf { it > 0 } ?: 1,
-            view.measuredHeight.takeIf { it > 0 } ?: 1,
-            Bitmap.Config.ARGB_8888
-        )
-        bitmap.applyCanvas {
-            view.draw(this)
+        view?.draw(fakeCanvas)
+        if (view?.parent != null) {
+            val viewParent = (view.parent as ViewGroup)
+
+            view.measure(
+                View.MeasureSpec.makeMeasureSpec(viewParent.width, View.MeasureSpec.AT_MOST),
+                View.MeasureSpec.makeMeasureSpec(viewParent.height, View.MeasureSpec.AT_MOST),
+            )
+            view.layout(0, 0, view.measuredWidth, view.measuredHeight)
+            val bitmap = Bitmap.createBitmap(
+                view.measuredWidth.takeIf { it > 0 } ?: 1,
+                view.measuredHeight.takeIf { it > 0 } ?: 1,
+                Bitmap.Config.ARGB_8888
+            )
+            bitmap.applyCanvas {
+                view.draw(this)
+            }
+            return BitmapDescriptorFactory.fromBitmap(bitmap)
+        } else {
+            val bitmap = Bitmap.createBitmap(
+                20,
+                20,
+                Bitmap.Config.ARGB_8888
+            )
+            return BitmapDescriptorFactory.fromBitmap(bitmap)
         }
-
-        return BitmapDescriptorFactory.fromBitmap(bitmap)
     }
 
     private sealed class ViewKey<T : ClusterItem> {