Fix an error when the value of 'operator' is 'or' or 'and' in addtionalCondition with FileMaker Server (affected version: 3.11, 4.0, 4.1, 4.2, 4.3)
Merge pull request #94 from msyk/fix-ispossibleoperator-of-filemaker-fx

Fix an error when the value of 'operator' is 'or' or 'and' in addtionalCondition with FileMaker Server