handle GTK+ init errors gracefully

For example if the DISPLAY env variable is incorrect


git-svn-id: https://fslint.googlecode.com/svn/trunk@292 494acc53-a219-0410-adff-8f8ff343f446

fslint-gui

@@ -22,12 +22,19 @@
  which is available at www.gnu.org
 """
 
+import types, os, sys, pipes, time, stat, tempfile, errno
+
 import gettext
 import locale
-import gtk
-import gtk.glade
 
-import types, os, sys, pipes, time, stat, tempfile, errno
+try:
+    import gtk
+except RuntimeError:
+    etype, emsg, etb = sys.exc_info()
+    sys.stderr.write(str(emsg)+'\n')
+    sys.exit(1)
+
+import gtk.glade
 
 time_commands=False #print sub commands timing on status line