Removed player_id check

* We want to send the receive receipt request regardless of null player_id

Author: mikechoch

iOS_SDK/OneSignalSDK/Source/OneSignalReceiveReceiptsController.m

@@ -43,12 +43,6 @@ - (void)sendReceiveReceiptWithNotificationId:(NSString *)notificationId {
     let sharedUserDefaults = OneSignalUserDefaults.initShared;
     let playerId = [sharedUserDefaults getSavedStringForKey:USERID defaultValue:nil];
     let appId = [sharedUserDefaults getSavedStringForKey:NSUD_APP_ID defaultValue:nil];
-    
-    if (!playerId) {
-        let message = [NSString stringWithFormat:@"OneSignal sendReceiveReceiptWithNotificationId notificationId: %@ failed with null playerId", notificationId];
-        [OneSignal onesignal_Log:ONE_S_LL_VERBOSE message:message];
-        return;
-    }
 
     [self sendReceiveReceiptWithPlayerId:playerId
                           notificationId:notificationId