Fix isTagActive

Author: Rokt33r

browser/main/SideNav/index.js

@@ -440,7 +440,7 @@ class SideNav extends React.Component {
 
     const style = {}
     if (!isFolded) style.width = this.props.width
-    const isTagActive = location.pathname.match(/tag/)
+    const isTagActive = !!location.pathname.match(/tag/)
     return (
       <div className='SideNav'
         styleName={isFolded ? 'root--folded' : 'root'}