🐛 (TfsWorkItemMigrationProcessor.cs): add check for field existence before accessing 'ClosedDate'

The code now checks if the "Microsoft.VSTS.Common.ClosedDate" field exists before attempting to access it. This prevents potential runtime errors when the field is not present in the work item, ensuring more robust and error-free execution.

Author: MrHinsh

src/MigrationTools.Clients.TfsObjectModel/Processors/TfsWorkItemMigrationProcessor.cs

@@ -419,12 +419,12 @@ private void PopulateWorkItem(WorkItemData oldWorkItemData, WorkItemData newWork
             }
 
             newWorkItem.Title = oldWorkItem.Title;
-            if (newWorkItem.Fields["Microsoft.VSTS.Common.ClosedDate"].IsEditable)
+            if (newWorkItem.Fields.Contains("Microsoft.VSTS.Common.ClosedDate") && newWorkItem.Fields["Microsoft.VSTS.Common.ClosedDate"].IsEditable)
             {
                 newWorkItem.Fields["Microsoft.VSTS.Common.ClosedDate"].Value = oldWorkItem.Fields["Microsoft.VSTS.Common.ClosedDate"].Value;
             }
             newWorkItem.State = oldWorkItem.State;
-            if (newWorkItem.Fields["Microsoft.VSTS.Common.ClosedDate"].IsEditable)
+            if (newWorkItem.Fields.Contains("Microsoft.VSTS.Common.ClosedDate") && newWorkItem.Fields["Microsoft.VSTS.Common.ClosedDate"].IsEditable)
             {
                 newWorkItem.Fields["Microsoft.VSTS.Common.ClosedDate"].Value = oldWorkItem.Fields["Microsoft.VSTS.Common.ClosedDate"].Value;
             }