Update: correctly configure the empty view if the delegate returns nil

Author: hassaanelgarem

Pod/Classes/WPMediaPickerViewController.m

@@ -696,7 +696,8 @@ - (UIViewController *)emptyViewController
     if ([self usingEmptyViewController]) {
         _emptyViewController = [self.mediaPickerDelegate emptyViewControllerForMediaPickerController:self];
     }
-    else {
+
+    if (_emptyViewController == nil) {
         _emptyViewController = self.defaultEmptyViewController;
     }