Temporarily fix memory layer outputs

Author: nyalldawson

python/plugins/processing/gui/DestinationSelectionPanel.py

@@ -225,4 +225,6 @@ def selectDirectory(self):
         self.leText.setText(dirName)
 
     def getValue(self):
+        if not self.leText.text():
+            return 'memory:'
         return self.leText.text()