added extra check for .glade file existence, cancels init when fails, refs #431
added extra check for .glade file existence, cancels init when fails, refs #431

git-svn-id: b62a74e6a85b74e782ead772f54cba8e909798b9@1229 6e728def-ac18-4b39-bad8-e7d984b3b6fa

aitjcize/Gummi,aitjcize/Gummi,aitjcize/Gummi,aitjcize/Gummi