Check for non-empty feed_contact_email field within feed_info.txt

[owades]

Describe the problem

The California Minimum General Transit Feed Specification (GTFS) Guidelines require that:

A technical contact is provided within the published GTFS Schedule dataset in the feed_contact_email field within the feed_info.txt file.

Since this is not a required field according to gtfs.org, this check is not currently performed by the validator.

Describe the new validation rule

If feed_contact_email field in feed_info.txt is empty, trigger a "missing_feed_contact_email" notice.

Sample GTFS datasets

No response

Severity

Warning

Additional context

No response

[isabelle-dr]

This use case is similar to what is described in #1277, my answer is the same 😊

[isabelle-dr]

I am labeling it as blocked. There is active work being done to modify the validator to support this use case, let's come back to this issue when we close issue #1067.