fallback from undefined for interpolation

because _t called with undefined interpolation name: errorDetail
even though when its undef its not used to sprinf-js would have been fine...

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/globals/UpdateCheckBar.js

@@ -47,7 +47,7 @@ export default React.createClass({
     },
 
     render: function() {
-        const message = _t(statusText[this.props.status], { errorDetail: this.props.detail });
+        const message = _t(statusText[this.props.status], { errorDetail: this.props.detail || '' });
 
         let image;
         if (doneStatuses.includes(this.props.status)) {