Allways show calendar link in working group view

[kesara]

Description

When there are no upcoming meetings for a WG, the datatracker doesn't show the WG meetings calendar link.
I think it might be a good idea to show the link/icon even when no meetings are scheduled.

This relates to #7524

Code of Conduct

• I agree to follow the IETF's Code of Conduct

[howethomas]

Picking this one as my first issue to fix, seems innocuous enough.

[kesara]

Fixed with #9182