Refine criteria for "workshop issues"
Refine criteria for "workshop issues"

* Treat empty string in Event.venue as an issue
* Treat empty string in Event.address as an issue

So basically this means NULL or "" in Event.venue and Event.address
will pop up as an issue.

vahtras/amy,vahtras/amy,swcarpentry/amy,vahtras/amy,swcarpentry/amy,pbanaszkiewicz/amy,swcarpentry/amy,pbanaszkiewicz/amy,pbanaszkiewicz/amy