Jira issue originally created by user noise085:
Comment created by nemek_zg:
My pull request (#548) contains an implementation of the method. Note that no exception is thrown if you query for the state of a non-existing filter - in such a case, false is returned as for disabled filters.
Comment created by @ocramius:
Was already handled in 2.3.x by [~guilhermeblanco]
Issue was closed with resolution "Fixed"