Merge pull request #523 from Iterable/MOB-5695]---Warn-instead-of-error-for-checkSDKinitialization

[MOB - 5695] Log warn instead of error

Author: Ayyanchira

iterableapi/src/main/java/com/iterable/iterableapi/IterableApi.java

@@ -308,7 +308,7 @@ private boolean isInitialized() {
 
     private boolean checkSDKInitialization() {
         if (!isInitialized()) {
-            IterableLogger.e(TAG, "Iterable SDK must be initialized with an API key and user email/userId before calling SDK methods");
+            IterableLogger.w(TAG, "Iterable SDK must be initialized with an API key and user email/userId before calling SDK methods");
             return false;
         }
         return true;