.NET for Android warning XA4305
Multidex is enabled, but `$(_AndroidMainDexListFile)` is empty.
Multidex is enabled, but the `$(_AndroidMainDexListFile)` file 'obj\Release\90\multidex.keep' does not exist.
The build process should automatically configure and populate the file for the
$(_AndroidMainDexListFile)
property, so please consider submitting a
bug if you are getting this warning under normal circumstances.