fix(MessageTemplate): App Icon showing the popup twice

Author: Alexis Oyama

Leanplum-SDK/Classes/LPMessageTemplates.m

@@ -1136,10 +1136,13 @@ - (void)setAlternateIconWithFilename:(NSString *)filename
         }
 
         [app setAlternateIconName:iconName completionHandler:^(NSError * _Nullable error) {
-            NSLog(@"Fail to change app icon: %@. Trying again.", error);
-
+            if (!error) {
+                return;
+            }
+            
             // Common failure is when setAlternateIconName: is called right upon start.
             // Try again after 1 second.
+            NSLog(@"Fail to change app icon: %@. Trying again.", error);
             dispatch_time_t dispatchTime = dispatch_time(DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC);
             dispatch_after(dispatchTime, dispatch_get_main_queue(), ^{
                 [[UIApplication sharedApplication] setAlternateIconName:iconName