Permissive casting of values

src/quorum/model.py

@@ -1832,7 +1832,9 @@ def _find_d(cls, kwargs):
             # the string based value into the target specific value for the query
             # otherwise uses the data type for the search field for value conversion
             if value_method: value = value_method(value, name_t)
-            else: value = name_t(value)
+            else:
+                try: value = name_t(value)
+                except ValueError: value = None
 
             # constructs the custom find value using a key and value map value
             # in case the operator is defined otherwise (operator not defined)