applications: show handler row when resetting is possible
If the user removes all file and link types associated with an application, the handler row does not show up anymore. This makes it impossible for the user to reset the default file and link types.
To fix this, make sure the handler row is visible whenever the "Reset" button is sensitive. Also add descriptive labels for the case that handler row appears without any file or link associations.
Here's how it behaves now:
Edited by Pedro Sader Azevedo