default_KID missing support

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Hi ,

I hope this message finds you well. I am writing to request the addition of support in ExoPlayer for MPD (DASH) files that do not include the default_KID attribute when using ClearKey protection (urn:mpeg:dash:mp4protection:2011).

Currently, many web players, including Shaka Player and JWPlayer, already support such MPD files, making it easier to play a wide range of DRM-protected content. However, ExoPlayer throws an error when trying to play these files due to the missing default_KID attribute. It would be extremely helpful if ExoPlayer could handle such cases as well, to ensure compatibility with more content providers and existing media streams.

Thanks