Katherine Shaw and Kristen Caldwell, co-owners of The Actor's Key, have pleaded no contest to charges brought by the City Attorney that they charged actors for auditions in violation of the state's Talent Scam Prevention Act. All charges were dropped, however, against Jessica Gardner, who was their office manager. All three vehemently deny that they did anything illegal. The Actor's Key, which filed for bankruptcy and went out of business in February, also pleaded no…