Show Errors, Make grids usable when no mandator is selected, move completed files also when reloading

MultiTool.Common/Documents/Document.vb

@@ -1,4 +1,5 @@
 Imports System.IO
+Imports MultiTool.Common.Constants
 Imports MultiTool.Common.Templates
 Imports MultiTool.Common.Winline.Entities
 
@@ -27,6 +28,18 @@ Namespace Documents
             End Get
         End Property
 
+        Public ReadOnly Property Errors As List(Of String)
+            Get
+                Dim oRowErrors = Rows.SelectMany(Function(row) row.Errors).ToList()
+                Dim oDocumentErrors As List(Of String) = GetDocumentErrors().
+                    Select(Function(err) err.ToString()).
+                    ToList()
+                Return oDocumentErrors.
+                    Concat(oRowErrors).
+                    ToList()
+            End Get
+        End Property
+
         Public ReadOnly Property MandatorId As String
             Get
                 Return Mandator?.Id
@@ -69,6 +82,17 @@ Namespace Documents
         Public Overrides Function Equals(obj As Object) As Boolean
             Return FullName = DirectCast(obj, Document).FullName
         End Function
+
+        Private Function GetDocumentErrors() As List(Of DocumentError)
+            Dim oErrors As New List(Of DocumentError)
+
+            If Mandator Is Nothing Then
+                oErrors.Add(DocumentError.MandatorNotFound)
+            End If
+
+            Return oErrors
+        End Function
+
     End Class
 
 End Namespace