EZ: Fix debug mode NPE in non-Fabric

Summary:
Fixes a NPE in debug mode. This will only impact developers who have explicitly turned this debug flag on, so it's a very low-pri fix.

Changelog: [Internal]

Reviewed By: makovkastar

Differential Revision: D24410825

fbshipit-source-id: 08c8a0c6d0e0fb7c132725ad6af9460b91a7edf3

ReactAndroid/src/main/java/com/facebook/react/uimanager/NativeViewHierarchyManager.java

@@ -262,7 +262,12 @@ public class NativeViewHierarchyManager {
       String className,
       @Nullable ReactStylesDiffMap initialProps) {
     if (DEBUG_MODE) {
-      FLog.d(TAG, "createView[%d]: %s %s", tag, className, initialProps.toString());
+      FLog.d(
+          TAG,
+          "createView[%d]: %s %s",
+          tag,
+          className,
+          (initialProps != null ? initialProps.toString() : "<null>"));
     }
     UiThreadUtil.assertOnUiThread();
     SystraceMessage.beginSection(