added some filter checks to throw errors earlier
added some filter checks to throw errors earlier

SirPython/Cardshifter,June92/Cardshifter,June92/Cardshifter,SirPython/Cardshifter,Cardshifter/Cardshifter,SirPython/Cardshifter,Cardshifter/Cardshifter,June92/Cardshifter,Cardshifter/Cardshifter