xcode 11 warnings

MVMCore/MVMCore/PresentationHandling/MVMCoreNavigationHandler.m

@@ -287,7 +287,6 @@
             operation.delegate = delegate;
             operation.completionBlock = completionBlock;
             [self.presentationQueue addOperation:operation];
-        
         }
     }];
 }

MVMCore/MVMCore/PresentationHandling/MVMCorePresentViewControllerOperation.m

@@ -9,6 +9,7 @@
 #import "MVMCorePresentViewControllerOperation.h"
 #import "MVMCoreAlertController.h"
 #import "MVMCorePresentAnimationOperation.h"
+#import "MVMCoreDispatchUtility.h"
 
 @interface MVMCorePresentViewControllerOperation ()
 
@@ -41,13 +42,14 @@ static void * XXContext = &XXContext;
 }
 
 - (void)main {
-    
-    // Always check for cancellation before launching the task.
-    if ([self checkAndHandleForCancellation]) {
-        return;
-    }
+    [MVMCoreDispatchUtility performBlockOnMainThread:^{
+        // Always check for cancellation before launching the task.
+        if ([self checkAndHandleForCancellation]) {
+            return;
+        }
 
-    [self present];
+        [self present];
+    }];
 }
 
 - (void)present {