AndFilter: Return false in matches if isValid returns false.
AndFilter: Return false in matches if isValid returns false.

Reviewed-by: Olli Salli (oggis) <20a519b27baa022954fba30203936bb6e51a67dc@collabora.co.uk>

detrout/telepathy-qt,anantkamath/telepathy-qt,tiagosh/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,anantkamath/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,detrout/telepathy-qt,anantkamath/telepathy-qt,TelepathyQt/telepathy-qt,tiagosh/telepathy-qt,TelepathyIM/telepathy-qt,special/telepathy-qt-upstream,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,special/telepathy-qt-upstream,TelepathyIM/telepathy-qt,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,freedesktop-unofficial-mirror/telepathy__telepathy-qt,tiagosh/telepathy-qt,special/telepathy-qt-upstream,TelepathyQt/telepathy-qt,tiagosh/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,TelepathyQt/telepathy-qt,detrout/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,TelepathyIM/telepathy-qt,TelepathyQt/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt