Steps to reproduce

Tested on 3.0 and trunk, probably affects all versions. If action operation "Send only to" is set to "- All -" it is not shown in "Used in actions" on "Media types" page.

1. Open action.
2. Click "Operations" tab.
3. Click "Edit" link.
4. Set "Send only to" to "- All -".
5. Click "Update" in Operatin details.
6. Click "Update" button (Doh!).
7. Go to "Administration -> Media types".
8. Observe the "Used in actions" column, the affected action is not in
   the media type list.

Expected result

Affected action exists in "Used in actions" list.

Actual result

Affected action does not exist in "Used in actions" list.

When editing the action if "Send only to" is set to specific Media type, it will be listed in "Used in actions" column.