[reports] If no reports available, "Add to report" button doesn't say it

If a user tries to add something to a report, but has no reports available on their report list, then no popup or notification comes up saying that the user cannot add those experiments since no reports exist.

Ideally, the pop-up should have another entry that says "new" or "create new report" that allows the user to create a new report from his/her selection.