In category repin does not shows errors in a separate page

In the category listing, when you click on the image then add to getlist, a pop-up window appears to re-pin the image. In that window, if there are errors, the errors are shown in the same window; before the errors where shown in a blanck page.
After that re-pin, the user goes to the profile.
Fix notification URL when commenting on a pin

When commenting on a ping a notification is generated pointing to the right pin URL
Utility to fix users lists