added no_labels flag

common/lib/capa/capa/inputtypes.py

@@ -836,11 +836,15 @@ class DragAndDropInput(InputTypeBase):
                 dic[attr_name] = Attribute(attr_name,
                     default=tag_attrs[tag_type][attr_name]).parse_from_xml(tag)
 
-            if tag_type == 'draggable':
+            if tag_type == 'draggable' and not self.no_labels:
                 dic['label'] = dic['label'] or dic['id']
 
             return dic
 
+        # add labels to images:
+        self.no_labels = Attribute('no_labels',
+                                        default="False").parse_from_xml(self.xml)
+
         to_js = dict()
 
         # image drag and drop onto