Contact groups property title not displayed

[redblom]

Describe the bug

The title of the contact groups property is not displayed on the contact form nor on the selected contact.

Steps to reproduce

1. Go to 'Show all contacts'
2. Click on 'New contact'
3. Scroll down to 'the Contact groups field'
4. See error:
   . the contact groups title is not shown
   . the browser console show the following error:

TypeError: this.property is undefined
    displayName PropertyTitle.vue:76
    VueJS 3
    render33 style-BUmqQo2P.chunk.mjs:12985
    VueJS 40
    ...

Expected behavior

The title should be displayed

Actual behavior

The title is not displayed

Contact version

7.1.0-dev.0 (repo main branche)

Operating system

ubuntu (nextcloud:30.0.6 docker image)

PHP engine version

PHP 8.2

Web server

Apache (supported)

Database

MariaDB

Additional info

A simple check for the existence of this.property seems to suffice; here:
https://github.com/sara-nl/nextcloud-contacts/blob/568a9c1962f1d849c65ecc11d5becbe0f89ce788/src/components/Properties/PropertyTitle.vue#L76

[GVodyanov]

Thanks a lot for the report, I'm on it!