#571234 by dereine: Better handling of invalid exposed filters or other methods that cause a view to abort during the build process.

#792582 by ducktape: Validate that view names are not purely numeric, which cannot be loaded by views_get_view().

#330160 by aditya_kristanto: Improve text to make it easier to find where to edit the view description.

#528838 by zzolo: If exposed form is in a block, and the form does not validate, ensure the form does not render twice.