fix(create-email): validate npm registry response and exit on invalid version

[Tyagiquamar]

Check response.ok when querying npm registry in getLatestVersionOfTag inside create-email. Immediately exit with error status if the npm HTTP request fails, tag is not found, or the version format is invalid/empty, preventing create-email from silently writing undefined versions into starter package.json.

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Summary by cubic

Fixes create-email to validate the npm registry response and exit with an error when the request fails or the version is empty/invalid, instead of silently writing undefined into the starter package.json.

^{Written for commit b334d41. Summary will update on new commits.}

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Latest commit: b334d41

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