#150 Wrong error message on missing file(s)

[Anonymous]

When a user opens a gnomebaker project, which points to to-be-burned-files, which aren't present anymore, the following error message occures:

"The plugin to handle a file of type (null) is not installed."

Furthermore it occures for each file not found! This can be a lot.

== Expected behaviour ==

An error message like the following should occure once:

"Some files could not be found."

Maybe display a list of the files.

sandoz@jpberlin.de