[DAPHNE-#867] Change ConfigParser::fileExists() behavior to not throw #867
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I consider this a bugfix but I'll run it through a PR to raise attention to the change. Tests are running fine (after fixing the one that tests the previous behavior). If there were no concerns raised by the time CI ran through I'll merge it right in.
Changing the behavior of fileExists() to a boolean operation as suggested by the method's name. Throwing an exception us up to the caller of this method.
Closes #867