Merge pull request #3721 from wordpress-mobile/issue/3720-npe-mysitefragment

fix #3720: by null checking mBlog

Author: hypest

WordPress/src/main/java/org/wordpress/android/ui/main/MySiteFragment.java

@@ -358,7 +358,15 @@ public void onEventMainThread(CoreEvents.MainViewPagerScrolled event) {
 
     @SuppressWarnings("unused")
     public void onEventMainThread(CoreEvents.BlogListChanged event) {
-        if (!isAdded() || (mBlog = WordPress.getBlog(mBlog.getLocalTableBlogId())) == null) return;
+        if (!isAdded() || mBlog == null) {
+            return;
+        }
+
+        // Update selected blog in case it was changed or deleted / removed.
+        mBlog = WordPress.getBlog(mBlog.getLocalTableBlogId());
+        if (mBlog == null) {
+            return;
+        }
 
         // Update view if blog has a new name
         if (!mBlogTitleTextView.getText().equals(mBlog.getBlogName())) {