We just had this discussion yesterday and our instructor came to the same conclusion as you did.
No information available to you, therefore under the legal beagle eyes you did something outside of the normal (excepted) operations.
He said that the manuals direcdted that all landings be made at FULL flaps, the exception being a NO FLAP landing whivch is covered in the Emergency Procedures.
Anything else and you are trying to be a test pilot and the lawyers will eat you (or your company) alive.
[paraphrased from his comments]

USMCFLYR