Fixed sendDeviceInfo crash

@@ -1723,7 +1723,7 @@ NSString *VERIFY_URL = @"/partners/cosmote/verify";
 
 - (void)sendDeviceInfoIfNecessary:(NSString *)newDeviceToken {
     
-    if ([Warply sharedService] != nil) {
+    if ([Warply sharedServiceExists] == YES) {
         [[Warply sharedService].pushManager sendDeviceInfoIfNecessary:newDeviceToken];
     }
     

@@ -135,6 +135,10 @@ typedef enum {
  */
 + (Warply *)sharedService;
 /*!
+ @abstract Returns if a shared instance of WLAppService exists.
+ */
++ (BOOL)sharedServiceExists;
+/*!
  @methodgroup Launching and Abolishing Warp service.
  */
 /*!

@@ -106,6 +106,16 @@ typedef void (^FailureResponse)(NSURLSessionDataTask * _Nullable task, NSError *
 }
 
 ///////////////////////////////////////////////////////////////////////////////
++ (BOOL)sharedServiceExists
+{
+    if (_sharedService != nil) {
+        return YES;
+    } else {
+        return NO;
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
 + (void)launchWithAppUUID:(NSString *)appUUID launchOptions:(NSDictionary *)launchOptions  customPushDelegate:(id <WLCustomPushHandler>)customPushDelegate serverBaseUrl:(NSString *)url
 {
     //Launch Once