[MlMt] Crashes every time selecting "Send Now" when quitting

[Christian Bailey]

Has happened consistently since the previous update. Still occurring 
after the latest 1.14 update (5897).

Steps to reproduce:
1) Send a message with a delay
2) Quit app
3) Dialog shows "Quit / Send Now / Cancel" - select "Send Now"

Outcome:
MlMt crashes and generates crash log
On re-loading, message that was in Outbox is now in Drafts and never 
gets sent

Top of log pasted below. Can send reminder if helpful.

Best regards,
Christian

-------------------------------------
Translated Report (Full Report Below)
-------------------------------------

Process:               MailMate [32745]
Path:                  
/Applications/MailMate.app/Contents/MacOS/MailMate
Identifier:            com.freron.MailMate
Version:               1.14 (5897)
Code Type:             ARM-64 (Native)
Parent Process:        launchd [1]
User ID:               501

Date/Time:             2022-05-20 13:45:08.8653 -0700
OS Version:            macOS 12.3.1 (21E258)
Report Version:        12
Anonymous UUID:        5EE33FDA-74CA-F331-CFD9-3836D1DB751A

Sleep/Wake UUID:       BB7372FE-55AA-4F16-81F4-464CF3187E43

Time Awake Since Boot: 70000 seconds
Time Since Wake:       958 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Application Specific Information:
Key equivalent ‘@q’.
abort() called


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