Don't slice non-existent tags (#4000)

js/src/ui/Tags/tags.js

@@ -16,13 +16,15 @@
 
 import React, { Component, PropTypes } from 'react';
 
+import { arrayOrObjectProptype } from '~/util/proptypes';
+
 import styles from './tags.css';
 
 export default class Tags extends Component {
   static propTypes = {
     handleAddSearchToken: PropTypes.func,
     setRefs: PropTypes.func,
-    tags: PropTypes.array
+    tags: arrayOrObjectProptype()
   }
 
   render () {

js/src/views/Account/Header/header.js

@@ -72,7 +72,7 @@ export default class Header extends Component {
           </div>
 
           <div className={ styles.tags }>
-            <Tags tags={ meta.tags.slice() } />
+            <Tags tags={ meta.tags } />
           </div>
           <div className={ styles.balances }>
             <Balance