Make pylint happy about handle_exception

The master branch has a better fix, deduplicating this function. But
code changes related to PyQt5 makes it non-trivial to backport. Fix the
warning directly, in all the function copies.

qubesmanager/backup.py

@@ -410,7 +410,7 @@ def backup_location_changed(self, new_dir=None):
 # Copyright (c) 2002-2007 Pascal Varet <[email protected]>
 
 def handle_exception(exc_type, exc_value, exc_traceback):
-    filename, line, dummy, dummy = traceback.extract_tb(exc_traceback).pop()
+    filename, line, _, _ = traceback.extract_tb(exc_traceback).pop()
     filename = os.path.basename(filename)
     error = "%s: %s" % (exc_type.__name__, exc_value)
 

qubesmanager/global_settings.py

@@ -303,7 +303,7 @@ def save_and_apply(self):
 # Copyright (c) 2002-2007 Pascal Varet <[email protected]>
 
 def handle_exception(exc_type, exc_value, exc_traceback):
-    filename, line, dummy, dummy = traceback.extract_tb(exc_traceback).pop()
+    filename, line, _, _ = traceback.extract_tb(exc_traceback).pop()
     filename = os.path.basename(filename)
     error = "%s: %s" % (exc_type.__name__, exc_value)
 

qubesmanager/qube_manager.py

@@ -1297,7 +1297,7 @@ def show_log(self, action):
 
 def handle_exception(exc_type, exc_value, exc_traceback):
 
-    filename, line, dummy, dummy = traceback.extract_tb(exc_traceback).pop()
+    filename, line, _, _ = traceback.extract_tb(exc_traceback).pop()
     filename = os.path.basename(filename)
     error = "%s: %s" % (exc_type.__name__, exc_value)
 

qubesmanager/restore.py

@@ -304,7 +304,7 @@ def backup_location_changed(self, new_dir=None):
 
 def handle_exception(exc_type, exc_value, exc_traceback):
 
-    filename, line, dummy, dummy = traceback.extract_tb(exc_traceback).pop()
+    filename, line, _, _ = traceback.extract_tb(exc_traceback).pop()
     filename = os.path.basename(filename)
     error = "%s: %s" % (exc_type.__name__, exc_value)
 

qubesmanager/template_manager.py

@@ -394,7 +394,7 @@ def vm_state_change(self, is_running, row=None):
 
 def handle_exception(exc_type, exc_value, exc_traceback):
 
-    filename, line, dummy, dummy = traceback.extract_tb(exc_traceback).pop()
+    filename, line, _, _ = traceback.extract_tb(exc_traceback).pop()
     filename = os.path.basename(filename)
     error = "%s: %s" % (exc_type.__name__, exc_value)