Remove a check for a non-existing array offset
Summary:
```
$attrs = array('title' => $file);
if (empty($attrs['href'])) {
```
makes no sense. Offset `'href'` on array `$attrs` never exists since the removal of the try/catch block in rPbe5b8968.
Test Plan: Read the code.
Reviewers: O1 Blessed Committers, avivey
Reviewed By: O1 Blessed Committers, avivey
Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D26505