#5838 Added checks for RichText() before initializing squire in Secure Reply message box

[martgil]

This PR fixes squire initialization for secure compose message box where newlines gets injected above the current line when Enter is pressed.

close #5838

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Tests (delete all except exactly one):

• Tests added or updated

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To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• addresses the issue it closes (if any)
• code is readable and understandable
• is accompanied with tests, or tests are not needed
• is free of vulnerabilities
• is documented clearly and usefully, or doesn't need documentation

[martgil]

Hi @sosnovsky - this one is ready for review. Thank you!

[martgil]

Hi @sosnovsky - Greetings. May I request for another review. thank you!

[sosnovsky]

All good now, thanks!

[martgil]

thank you, too.