The cancellation of the St. Louis Pet Expo this weekend poses a steep disappointment to an expected 20,000+ animal lovers and 175 vendors. Yet while the St. Charles Convention Center claims it axed the event due to "unmet contractual obligations," the expo's St. Louis-based organizers say the blame lies with a disgruntled employee — one who apparently believes she is "a prophet tasked with writing a new book of the Bible" and "Moses reincarnated."…