Fix for Xcode 7 runtimes that don't have devices

Fix for Xcode 7 runtimes that don't have devices
Xcode 7 includes "Resizable iPad" and "Resizable iPhone" in the list of
runtimes, but they don't have corresponding device types.

ios-sim would throw an error about calling replace on undefined due to
failing to look up the device type in the name_id_map.