fix process.on('uncaughtException') handling link mathias suggested

execSync a child process that sends an email (which is unfortunately, async), then quit, so process doesn't keep running in an undefined state

Locate the process.on('uncaughtException') handler and the execSync path that sends email. Start by tracing how the child process is launched and how shutdown currently behaves; done means the email-sending child completes while the application then exits cleanly instead of remaining in an undefined state.

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