Unable to use mailvelope in Apple devices

[Niveshkrishna]

Describe the bug
A clear and concise description of what the bug is

Maileveloppe mentions the body of the message is empty and the webmail doesn't process sending the message. It is also impossible to save. So the feature is completely broken.

To Reproduce
Steps to reproduce the behavior:

1. Go to snappmail and compose new mail
2. Click on mailvelope extension
3. Write mail and select some user's public key to encrypt
4. Try to send, we fail with message 'Message body is empty`

Expected behavior
A clear and concise description of what you expected to happen.

Send mail with encrypted data

Screenshots
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Please complete the following information:

• Browser: [e.g. chromium 100, firefox 100, safari 14, mobile]
• IMAP daemon: [e.g. courier, dovecot]
• PHP version:
• SnappyMail Version:
• Mode: [e.g. standalone, nextcloud, cyberpanel, docker]

Debug/logging information
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Additional context
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[Niveshkrishna]

This could be an issue with mailvelope as well

[Niveshkrishna]

Thanks for the fix @the-djmaze. I will test it out when it is available and update you about it