11539 empty lookup handle non boolean params

netbox/extras/lookups.py

@@ -1,3 +1,4 @@
+from distutils.util import strtobool
 from django.db.models import CharField, Lookup
 
 
@@ -7,11 +8,21 @@ class Empty(Lookup):
     """
     lookup_name = 'empty'
 
+    def convert_parm_to_bool(self, param):
+        try:
+            ret = str(strtobool(param))
+        except ValueError:
+            ret = "false"
+
+        return ret
+
     def as_sql(self, qn, connection):
         lhs, lhs_params = self.process_lhs(qn, connection)
         rhs, rhs_params = self.process_rhs(qn, connection)
+        rhs_params = [str(self.convert_parm_to_bool(param)) for param in rhs_params]
         params = lhs_params + rhs_params
-        return 'CAST(LENGTH(%s) AS BOOLEAN) != %s' % (lhs, rhs), params
+        s = f'CAST(LENGTH({lhs}) AS BOOLEAN) != {rhs}'
+        return (s, params)
 
 
 CharField.register_lookup(Empty)