[codex] skip empty vCard addresses

[chaochaoweb3]

Summary

• skip HOME and WORK address entries when all address fields are blank
• keep existing vCard output unchanged when any address field is present

Why

The vCard endpoint always called addAddress() for HOME and WORK. On iOS this can create empty HOME/WORK address entries, making the device try to resolve a location from just the label.

Fixes #961.

Validation

• git diff --check
• php -l app/Http/Controllers/UserController.php not run: PHP is not installed in this local environment

[chaochaoweb3]

Rebased this onto the latest upstream main, corrected the commit author metadata, and marked it ready for review. I also triggered a fresh Scrutinizer run; it still reports repository-level analysis errored / tests failed with no artifacts exposed, and the Scrutinizer API shows the tracked main build is already failed. Local validation available here was git diff --check.

[JulianPrieber]

Thank you. I will check this soon.
Scrutinizer is having some problems with the mainline build.

Ideally we'll test this in the beta build.