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java.lang.IllegalArgumentException: credential identifier cannot be empty	at com.google.android.gms.common.internal.zzaa.zzh(Unknown Source)	at com.google.android.gms.auth.api.credentials.Credential.(Unknown Source)	at com.google.android.gms.auth.api.credentials.Credential$Builder.build(Unknown Source)	at com.firebase.ui.auth.ui.account_link.SaveCredentialsActivity.onConnected(SaveCredentialsActivity.java:120)	at com.google.android.gms.common.internal.zzl.zzm(Unknown Source)	at com.google.android.gms.internal.zzof.zzk(Unknown Source)	at com.google.android.gms.internal.zzod.zzsb(Unknown Source)	at com.google.android.gms.internal.zzod.onConnected(Unknown Source)	at com.google.android.gms.internal.zzoh.onConnected(Unknown Source)	at com.google.android.gms.internal.zznw.onConnected(Unknown Source)	at com.google.android.gms.common.internal.zzk$1.onConnected(Unknown Source)	at com.google.android.gms.common.internal.zzd$zzj.zztp(Unknown Source)	at com.google.android.gms.common.internal.zzd$zza.zzc(Unknown Source)	at com.google.android.gms.common.internal.zzd$zza.zzw(Unknown Source)	at com.google.android.gms.common.internal.zzd$zze.zztr(Unknown Source)	at com.google.android.gms.common.internal.zzd$zzd.handleMessage(Unknown Source)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:145)	at android.app.ActivityThread.main(ActivityThread.java:5832)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)