Revert "fix: show the default validation message when there is a required error (#386)"

This reverts commit ac301f8950.

src/Mixin.js

@@ -166,7 +166,7 @@ module.exports = {
     return this.state._isRequired;
   },
   showError: function () {
-    return this.showRequired() && !this.isValid();
+    return !this.showRequired() && !this.isValid();
   },
   isValidValue: function (value) {
     return this.context.formsy.isValidValue.call(null, this, value);

src/main.js

@@ -278,7 +278,7 @@ Formsy.Form = React.createClass({
         }
 
         if (isRequired) {
-          var error = validationErrors[requiredResults.success[0]] || validationError;
+          var error = validationErrors[requiredResults.success[0]];
           return error ? [error] : null;
         }