I can't find anything on the PA DMV website relating directly to motorcycles and traffic signals that don't recognize them.
There was this, though...
Chapter 31, subsection 3112.
(c) Inoperable or malfunctioning signal.--If a traffic-control signal is out of operation or is not functioning properly, vehicular traffic facing a:
(1) Green or yellow signal may proceed with caution as indicated in subsection (a)(1) and (2).
(2) Red or completely unlighted signal shall stop in the same manner as at a stop sign, and the right to proceed shall be subject to the rules applicable after making a stop at a stop sign as provided in section 3323 (relating to stop signs and yield signs).
(Dec. 21, 1998, P.L.1126, No.151, eff. 60 days)
Now, technically, if the light doesn't change it's a malfunctioning signal. All traffic signals are supposed to be able to be triggered by all street legal motor vehicles.
So, IF you got stopped you could probably cite this and, if you're lucky, the cop will let it go at that. If not, the magistrate will probably go with it.
Although, if you have to go before a magistrate you would probably be well served to call the local municipal office and report the light as malfunctioning. It's unlikely that you'd get away with it twice if you don't.