Fix segfault when attempting to generate or enter in an invalid game variant.
Summary: This change resolves T5981. The segfault is fixed by checking whether or not a Game object is valid, before letting the user play with it. Test Plan: Manually added a borked game variant in KSudoku::updateShapesList() using a CustomGameVariant with null QUrl. Compiled and verified the segfault no longer occurred. ``` /* * For the purpose of testing the change, a deliberately borked game variant. * TODO: remove in final version of diff. */ variant = new CustomGame(i18n("Invalid TODO Remove me"), QUrl(), m_gameVariants); variant->setDescription(i18n("Invalid TODO Remove me")); variant->setIcon("ksudoku-ksudoku_9x9"); ``` Reviewers: #kde_games, ltoscano Reviewed By: ltoscano Subscribers: ltoscano, #kde_games Maniphest Tasks: T5981 Differential Revision: https://phabricator.kde.org/D5671
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