0002978: ExportCd plug-in should not load if burn:// scheme is unsupported

applied patch by Brad Crittenden.

Patch goes in the right direction but still not far enough. On my ubuntu gnome system (9.04) it doesn't load the plugin, but I can burn a cd in nautilus using the burn:/// scheme.


svn: r12922

src/plugins/export/ExportCd.py

@@ -3,6 +3,7 @@
 #
 # Copyright (C) 2000-2008  Donald N. Allingham
 # Copyright (C) 2008       Brian G. Matherly
+# Contributions 2009 by    Brad Crittenden <brad [AT] bradcrittenden.net>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -68,6 +69,14 @@ try:
 except:
     from gnome.vfs import (URI, create, OPEN_WRITE, make_directory, 
                            FileExistsError)
+    
+#This plugin only works if the 'burn://' scheme is supported.
+try:
+    uri = URI('burn:///test.txt')
+except TypeError:
+    raise Errors.UnavailableError(
+        _("Cannot be loaded because the 'burn://' scheme "
+          "is not supported."))
 
 #-------------------------------------------------------------------------
 #