PLEASE DONT BUILD THIS ON YOUR ACTUAL PHONE!
This is a sample project which only consists of a malformed SyncAdapter, i.e. authenticator.xml, syncadapter.xml and AndroidManifest.xml entries.
Leaving android:accountType OR android:contentAuthority in the syncadapter.xml file empty results in a broken system.
I filed a bug report which you can follow here: https://code.google.com/p/android/issues/detail?id=261565