Failed migrating [Umbraco.Grid - pageContent] : Cannot access child value on Newtonsoft.Json.Linq.JValue.

[gheorghe-efros]

uSyncMigrations/uSync.Migrations.Migrators/BlockGrid/BlockMigrators/GridMediaBlockMigrator.cs

Line 29 in 42c2a38

if (control.Value == null) return properties;

This gives and error when value control.Value is empty.
To resolve it I added changed line to be like this - if (control.Value == null || control.Value.HasValues == false) return properties;