Loading icon remains stuck when you Share a page by email using an email address

Preconditions: Have the mail sending configured.
Steps to reproduce:

1. Log in as Admin or simple user
2. Click on Home page
3. Click on More Actions > Share by email
4. Type an email address in the Send to text box
5. Select the email
6. Click on the Send button

Expected results: The message that the email was sent appears.

Actual results: The message that the email was sent appears, but, in the background the loading icon appears to be stuck.
Note: I believe this is because of https://jira.xwiki.org/browse/XWIKI-15415