Regression: Only add reply-to if sender has emails

[sampaiodiego]

Proposed changes

E-mail notifications were broken for livechat when using Manual Selection routing method because the sender is the visitor in this context and it has no email addresses.

Issue(s)

How to test or reproduce

• Set livechat routing method to Manual Selection
• Start a new livechat

Screenshots

Types of changes

• 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

Changelog

Further comments