Fix to CEHorizontalSwipeInteractionController when UIPanGestureRecognizer translation.x == 0

Sometimes handleGesture: incorrectly sets the BOOL rightToLeftSwipe to
false when it should be true…This is due to [gestureRecognizer
translationInView:gestureRecognizer.view.superview] sporadically
returning {0, 0}; usually this occurs when making slow, methodical
movement swipes while starting at center of view window.  Solution is
to break anytime {0, 0} is returned (where translation.x == 0) so that
nothing happens.

Author: kerryknight

InteractionControllers/CEHorizontalSwipeInteractionController.m

@@ -42,6 +42,8 @@ - (void)handleGesture:(UIPanGestureRecognizer*)gestureRecognizer {
     switch (gestureRecognizer.state) {
         case UIGestureRecognizerStateBegan: {
 
+            if (translation.x == 0) break;//if no horizontal translation returned, simply break and do nothing
+            
             BOOL rightToLeftSwipe = translation.x < 0;
 
             // perform the required navigation operation ...