Update for Android-specific project set `bundleSeedId` value to "" and display error on descriptor generation

Updates for the Android-only variant of ANEs will drop the iOS-specific `bundleSeedId` value to "" and then display an error message that this value is missing and not generate a descriptor after this.

Thoughts about it:
1. It does not drop the set value to "".
2. It should generate descriptor without ios-specific parameters.