Define missing variable

weblate/trans/views.py

@@ -1107,6 +1107,7 @@ def translate(request, project, subproject, lang):
             units = allunits.filter(position__gt = pos)
     elif 'checksum' in request.GET:
         allunits = obj.unit_set.filter(checksum = request.GET['checksum'])
+        units = allunits
     else:
         allunits = obj.unit_set.filter_type(rqtype, obj)
         # What unit set is about to show