Regression: Fix setting reply-to email header

[sampaiodiego]

Proposed changes

Fix the following error

W20200622-19:13:23.208(-3)? (STDERR) (node:52243) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
W20200622-19:22:19.636(-3)? (STDERR) === UnHandledPromiseRejection ===
W20200622-19:22:19.637(-3)? (STDERR) TypeError: Cannot set property 'Reply-To' of undefined
W20200622-19:22:19.637(-3)? (STDERR)     at getEmailData (app/lib/server/functions/notifications/email.js:163:3)
W20200622-19:22:19.638(-3)? (STDERR)     at app/lib/server/lib/sendNotificationsOnMessage.js:162:12
W20200622-19:22:19.638(-3)? (STDERR)     at Array.some (<anonymous>)
W20200622-19:22:19.638(-3)? (STDERR)     at app/lib/server/lib/sendNotificationsOnMessage.js:158:19
W20200622-19:22:19.638(-3)? (STDERR)     at /Users/diegosampaio/.meteor/packages/promise/.0.11.2.1xavwef.9sbp++os+web.browser+web.browser.legacy+web.cordova/npm/node_modules/meteor-promise/fiber_pool.js:43:40
W20200622-19:22:19.638(-3)? (STDERR) ---------------------------------
W20200622-19:22:19.638(-3)? (STDERR) Errors like this can cause oplog processing errors.
W20200622-19:22:19.641(-3)? (STDERR) Setting EXIT_UNHANDLEDPROMISEREJECTION will cause the process to exit allowing your service to automatically restart the process
W20200622-19:22:19.641(-3)? (STDERR) Future node.js versions will automatically exit the process
W20200622-19:22:19.642(-3)? (STDERR) =================================

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• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Hotfix (a major bugfix that has to be merged asap)
• Documentation Update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

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