qubes.py: handle nicely situation when create_appmenus exits with error

dom0/qvm-core/qubes.py

@@ -1609,11 +1609,14 @@ class QubesAppVm(QubesVm):
         if source_template is None:
             source_template = self.template_vm
 
+        try:
             if source_template is not None:
                 subprocess.check_call ([qubes_appmenu_create_cmd, source_template.appmenus_templates_dir, self.name])
             else:
                 # Only add apps to menu
                 subprocess.check_call ([qubes_appmenu_create_cmd, "none", self.name])
+        except subprocess.CalledProcessError:
+            print "Ooops, there was a problem creating appmenus for {0} VM!".format (self.name)
 
 
 class QubesVmCollection(dict):