Fix: #746 (#749)

Author: leonelcamara

pydal/objects.py

@@ -2539,7 +2539,11 @@ def referenced_field(self):
         if not self._db or tablename not in self._db:
             # The table being referenced is not defined yet
             return None
-        table = self._db[tablename]
+        try:
+            table = self._db[tablename]
+        except AttributeError:
+            # The table being referenced is lazy and not available yet
+            return None
         return table[fieldname] if fieldname else table._id
 
     def referenced_table(self):