Warn unknown devices: Add a send anyway button.
Warn unknown devices: Add a send anyway button.

Add weakSelf sanity check.

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