Made backups more robust

Will now explicitly try to delete temporary backup folder, which would only already exist if a previous backup failed to complete / didn't get to moving the temp folder

addon_updater.py

@@ -721,13 +721,19 @@ def create_backup(self):
 
 		if self._verbose: print("Backup destination path: ",local)
 
-		if os.path.isdir(local) == True:
+		if os.path.isdir(local):
 			try:
 				shutil.rmtree(local)
 			except:
 				if self._verbose:print("Failed to removed previous backup folder, contininuing")
 
-		# make the copy
+		# remove the temp folder; shouldn't exist but could if previously interrupted
+		if os.path.isdir(tempdest):
+			try:
+				shutil.rmtree(tempdest)
+			except:
+				if self._verbose:print("Failed to remove existing temp folder, contininuing")
+		# make the full addon copy, which temporarily places outside the addon folder
 		if self._backup_ignore_patterns != None:
 			shutil.copytree(
 				self._addon_root,tempdest,