feat(np): Warn, don't fail on missing test email configuration

[hobzcalvin]

While testing #114505 it was helpful to use e.g. sentry notifications send email --source 'data-export-success' without having an actual email backend set up. This turns the exception into a warning.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Contradictory output: warns "won't send" then says "sent"

Low Severity

After removing the early return, the code now warns "Email will not actually send with current configuration!" but then unconditionally prints "Example '{source}' email sent to {email}." on line 65. These messages directly contradict each other. The success message doesn't account for the case where the email config is known to be non-functional. Adjusting the final message to reflect the warning (e.g., distinguishing "processed" from "sent") would avoid confusing developers using this debugging tool.

Additional Locations (1)

• src/sentry/runner/commands/notifications.py#L50-L56

 

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[sentry]

Bug: Removing the return causes the send-test-notification command to crash for users without email configured, as it attempts to connect to an SMTP server with None credentials.
_{Severity: MEDIUM}

Suggested Fix

Restore the early return statement after logging the warning for missing email configuration. This will prevent the code from attempting to send an email via the SMTP backend when no valid settings are available, thus avoiding the unhandled exception.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: src/sentry/runner/commands/notifications.py#L56-L57

Potential issue: The removal of a `return` statement after a warning for missing email
configuration will cause the `send-test-notification` command to crash for users without
email settings. The code will proceed to call `get_connection()` with `None` for
`mail.host`, `mail.port`, and other credentials. This leads to an unhandled connection
error when Django's SMTP mail backend attempts to connect to a `None` host. The
exception propagates up the call stack (`notify_sync` -> `notify_target` ->
`provider.send`) and terminates the command.

_{Did we get this right? 👍 / 👎 to inform future reviews.}