Add error check

Author: cjmyers

lib/actions/updateCollectionIcon.js

@@ -17,8 +17,12 @@ module.exports = function (req, res) {
   if (req.method === 'GET') {
     const collectionIcons = config.get('collectionIcons')
     const iconFile = collectionIcons[uri]
-    const dir = path.resolve(__dirname, '../../public')
-    res.sendFile(iconFile, { root: dir })
+    if (iconFile) {
+      const dir = path.resolve(__dirname, '../../public')
+      res.sendFile(iconFile, { root: dir })
+    } else {
+      res.status(403).type('text/plain').send('No icon for this collection')
+    }
   } else {
     return getOwnedBy(uri, graphUri).then((ownedBy) => {
       if (ownedBy.indexOf(config.get('databasePrefix') + 'user/' + req.user.username) === -1) {