return dummy location data for unknown routers

inventory_provider/routes/classifier.py

@@ -38,24 +38,23 @@ def _location_from_router(router_name):
     result = r.get(f'opsdb:location:{router_name}')
     if not result:
         logger.error(f'error looking up location for {router_name}')
-        return None
-        # return {
-        #     'a': _LOCATION(
-        #         equipment=router_name,
-        #         name='?',
-        #         abbreviation='?')
-        # }
+        return {
+            'a': _LOCATION(
+                equipment=router_name,
+                name='?',
+                abbreviation='?')
+        }
 
     result = json.loads(result.decode('utf-8'))
     if not result:
         logger.error(f'sanity failure: empty list for location {router_name}')
         return None
-        # return {
-        #     'a': _LOCATION(
-        #         equipment=router_name,
-        #         name='?',
-        #         abbreviation='?')
-        # }
+        return {
+            'a': _LOCATION(
+                equipment=router_name,
+                name='?',
+                abbreviation='?')
+        }
 
     return {
         'a': _LOCATION(