Fix "undefined" in className (#3939)

diff --git a/app/javascript/mastodon/components/permalink.js b/app/javascript/mastodon/components/permalink.js
index 5d3e4738d04ba48c00c35a4adfd31b2d7367ed13..0b7d0a65ad9df83aad7a34a31f8cab7684592c34 100644 (file)
--- a/app/javascript/mastodon/components/permalink.js
+++ b/app/javascript/mastodon/components/permalink.js
@@ -25,7 +25,7 @@ export default class Permalink extends React.PureComponent {
     const { href, children, className, ...other } = this.props;
 
     return (
-      <a href={href} onClick={this.handleClick} {...other} className={'permalink ' + className}>
+      <a href={href} onClick={this.handleClick} {...other} className={`permalink${className ? ' ' + className : ''}`}>
         {children}
       </a>
     );