Some errors spoted by file source checkers

src/chat_control.py

@@ -259,7 +259,7 @@ def _on_banner_eventbox_button_press_event(self, widget, event):
 	def _on_send_button_clicked(self, widget):
 		'''When send button is pressed: send the current message'''
 		if gajim.connections[self.account].connected < 2: # we are not connected
-			dialog = dialogs.ErrorDialog(_('A connection is not available'),
+			dialogs.ErrorDialog(_('A connection is not available'),
 				_('Your message can not be sent until you are connected.'))
 			return
 		message_buffer = self.msg_textview.get_buffer()
@@ -465,7 +465,7 @@ def _on_message_textview_mykeypress_event(self, widget, event_keyval,
 					send_message = True
 				
 			if gajim.connections[self.account].connected < 2: # we are not connected
-				dialog = dialogs.ErrorDialog(_('A connection is not available'),
+				dialogs.ErrorDialog(_('A connection is not available'),
 					_('Your message can not be sent until you are connected.'))
 				send_message = False
 

src/common/xmpp/simplexml.py

@@ -252,7 +252,7 @@ def __setitem__(self,item,val):
 		return self.setAttr(item,val)
 	def __delitem__(self,item):
 		""" Deletes node's attribute "item". """
-		return self.delAttr(item,val)
+		return self.delAttr(item)
 	def __getattr__(self,attr):
 		""" Reduce memory usage caused by T/NT classes - use memory only when needed. """
 		if attr=='T':

src/message_control.py

@@ -68,7 +68,7 @@ def shutdown(self):
 		# NOTE: Derived classes MUST implement this
 		pass
 
-	def repaint_themed_widgets(self, theme):
+	def repaint_themed_widgets(self):
 		pass # NOTE: Derived classes SHOULD implement this
 
 	def update_ui(self):