MediaFile: support more media types

Change-Id: Ib3109c5ebc762b97e45bd0bb5fa82ad77b0e6822
CM11 Themes: Ensure customTheme is not null.

The configuration retrieved via getConfiguration() sometimes contains
a null customTheme which results in the theme returning to holo when
applying a component such as icons.  Icons will change but styles
and fonts would return to the default.

Change-Id: Iac0cb8eed5de8fdc9fe8efd697d968f26e801c08