Haven't seen this covered here in a bit...
On occassion I have submitted a blank report, not too often though.
The one I usually use (which gets submitted to the Exec Director and Tech Director) includes the standard schedule for the day/night, attendance, department breakdowns (lighting/sound, costumes, props, etc) and office notes.
The majority of mine are usually what we still need done from whatever department. Sometimes it's documentation of coflicts between production staff and / or actors.
Although a report I submitted for the last show I did included an encounter between me and an actor & actress doing some inappropriate things in a very dark stairwell...