Amplify Android 1.6.9

DataStore

• Put missing column name in a verbose log (#1068)
• Verbose log instead of warn when deleting a non existent item (#1081)
• Remove overloaded query method in favor of just one (#1092)
• fix: Publish networkStatus event at correct times (#1067)
• fix: Defer merger.merge to avoid failure if outbox has mutation (#1082)
• fix: Make PersistentMutationOutbox operations synchronized (#1085)
• fix: Publish each cascading delete (#1059)
• fix: Continue processing outbox items after removal (#1084)

Auth

• Add explicit error for signin cancelation (#1073)

API

• Don't fire any terminal event when a REST operation is canceled (#1072)
• fix: serialize nulls on requests to support setting fields to null (#1091)