Data validation handling for nill errorfunction

servicebuildermdl/servicebuildermdl.go

@@ -293,7 +293,7 @@ func (sb *ServiceBuilder) executeValidationFunction(dataKey string, fn func(inte
 // executeErrorFunction exceute when validation failed for any step
 func (sb *ServiceBuilder) executeErrorFunction(fn func() (map[string]interface{}, error)) (*interface{}, error) {
 	if fn == nil {
-		return nil, nil
+		return nil, errors.New("Data Validation failed and No recovery function found")
 	}
 	_, err := fn()
 	if errormdl.CheckErr(err) != nil {