Merge pull request #1138 from mewtaylor/issue/gh-1097

Fix GH-1097: Don’t validate username server side unless it passes client-side checks

src/components/registration/steps.jsx

@@ -136,7 +136,9 @@ module.exports = {
             }.bind(this));
         },
         onUsernameBlur: function (event) {
+            if (this.refs.form.refs.formsy.inputs[0].isValidValue(event.currentTarget.value)) {
                 this.validateUsername(event.currentTarget.value);
+            }
         },
         onValidSubmit: function (formData) {
             this.setState({waiting: true});