bitbake: lib/ui/taskexp: Validate gi import

When running bitbake -g -u taskexp without having gi python module or
and invalid gtk version, bitbake fails with a stack trace.

In case of import or version error, bitbake should exit with an error
message instead of a stack trace.

(Bitbake rev: 2a2c507f239b047f34765312df4168030e38b90d)

Signed-off-by: David Khouya <dakhouya@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/taskexp.py

@@ -8,9 +8,15 @@
 #
 
 import sys
-import gi
-gi.require_version('Gtk', '3.0')
-from gi.repository import Gtk, Gdk, GObject
+
+try:
+    import gi
+    gi.require_version('Gtk', '3.0')
+except ValueError:
+    sys.exit("FATAL: Gtk version needs to be 3.0")
+except ImportError:
+    sys.exit("FATAL: Gtk ui could not load the required gi python module")
+
 import threading
 from xmlrpc import client
 import bb