Skip schema validation when value is empty

Author: Mosoc

packages/canner/src/hocs/validation.js

@@ -130,7 +130,7 @@ export default function withValidation(Com: React.ComponentType<*>) {
         if(checkSchema(schema)) {
           promiseQueue.pop(_schemaValidation(schema, errorMessage)(value));
         }
-        if(checkValidator(validator)) {
+        if(value && checkValidator(validator)) {
           promiseQueue.pop(_customizedValidator(validator)(value));
         }
       }