[Bug] Rejecting application error 500 -> Undefined variable $denied_message

[piratkongen]

Describe the bug
When in Staff Area, clicking on 'Applications' to view applications, then clicking into an entry,
and clicking 'Deny', it throws error 500.

Expected behavior
Reject an application and email is sent to applicant.

UNIT3D (please complete the following information):

• UNIT3D Version: v5.1
• Laravel Version: Ver. 8.21.0
• PHP Version: php8.0.0
• Database Driver & Version: 8.0.22-0
• Web Server Driver & Version: ubuntu0.20.04.3

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Google Chrome
• Version: 87.0.4280

Stack error:

`

Undefined variable $denied_message (View: /var/www/html/resources/views/emails/deny_application.blade.php) {"userId":3,"exception":"[object] (ErrorException(code: 0): Undefined variable $denied_message (View: /var/www/html/resources/views/emails/deny_application.blade.php) at /var/www/html/storage/framework/views/944782a018f12e404290c0e7d836a21c4614c80c.php:4) | Stack
-- | --



--
`

And no email is sent to applicant.