Merge pull request #826 from redpandalabs/patch-1

swallow TypeError only if related to compatibility

flask_admin/model/base.py

@@ -1546,12 +1546,15 @@ class BaseModelView(BaseView, ActionsMixin):
         """
         try:
             self.on_model_change(form, model, is_created)
-        except TypeError:
+        except TypeError as e:
+            if re.match(r'on_model_change\(\) takes .* 3 .* arguments .* 4 .* given .*', e.message):
                 msg = ('%s.on_model_change() now accepts third ' +
                        'parameter is_created. Please update your code') % self.model
                 warnings.warn(msg)
 
                 self.on_model_change(form, model)
+            else:
+                raise
 
     def after_model_change(self, form, model, is_created):
         """