JOHNSTOWN — An undisclosed churchgoer left $25,000 in stock certificates for a faith-affiliated community organization after his death last summer. Or so they thought. Over time, estate attorneys discovered more and more funds left for One Church Street. It took about six months to uncover the full $600,000-plus sum. "I mean, it certainly is a lesson for me personally," said Rev. Laurie Garramone of the St. John's Episcopal Church and One Church Street. "There's a lot you can do, even if you are no longer walking the Earth to sustain things that are important to you." The donor spent decades…