Mostra erros em AppConfig (#3042)

sapl/base/views.py

@@ -1958,6 +1958,19 @@ class AppConfigCrud(CrudAux):
                     self.gerar_hash(prop)
             return super().form_valid(form)
 
+        def form_invalid(self, form):
+            errors_tuple = [(form[e].label, form.errors[e])
+                            for e in form.errors if e in form.fields]
+            error_message = '<ul>'
+            for e in errors_tuple:
+                error_message += '<li><b>%s</b>: %s</li>' % (e[0], e[1][0])
+            for e in form.non_field_errors():
+                error_message += '<li>%s</li>' % e
+            error_message += '</ul>'
+
+            messages.add_message(self.request, messages.ERROR, error_message)
+            return super().form_invalid(form)
+
         def gerar_hash(self, inst):
             inst.save()
             if inst.texto_original: