[Bug 22094] New: 'be a maintainer for this version' does not accept NULL input

http://bugs.winehq.org/show_bug.cgi?id=22094

Summary: 'be a maintainer for this version' does not accept
                    NULL input
           Product: WineHQ Apps Database
           Version: unspecified
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: trivial
          Priority: P2
         Component: appdb-unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

I'm an AppDB admin, so, e.g., when I submit a new bug link, it appears
instantly, not needing confirmation by maintainer/admin. If I apply to be a
maintainer of an application and choose submit (with no explanation), it
returns to the main page without making me a maintainer. If I put anything in
it (even just 'a'), I am made a maintainer.

Minor, but slightly annoying. May only want to enable NULL inputs for admin's
only, or alternatively, return an error saying it must not be empty.