NPE Bug,at: RealmProxy#toString() ,if there are nullable byte[]

[Raynor999]

Goal

No Crash

Actual Results

throw NPE ，using nullable field.

NPE：caused by this changed #6767

 field is ByteArray -> {
                            emitStatement("stringBuilder.append(\"binary(\" + field.length + \")\")")
                        }

log:
Caused by: java.lang.NullPointerException: Attempt to get length of null array
at : io.realm.com_sundayfun_daycam_data_ShotRealmProxy.toString()

Version of Realm and tooling

Realm version(s): 7.0.3

Realm Sync feature enabled: NO

language: Kotiln, kapt.