BugFix: App crashes when user resumes it on push notif.
BugFix: App crashes when user resumes it on push notif.

This crash happens when the app when backgrounded whereas the expanded header was displayed on chat screen.

vector-im/riot-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/vector-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/riot-ios,vector-im/riot-ios