Android: Hide warning icon for sdk if the setting is empty

Change-Id: Idf86cbf8679afcd6054c1f191619a44b576c6f45
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Android Kits: Use ANDROID_TARGET_ARCH in display name

Note this only affects newly generated kits.

Task-number: QTCREATORBUG-9865
Change-Id: I9f62c1d1932aa32e1a307b92ce0f8ba80bb6ed5c
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>