Tweak logging, ZUGFeRD Import

Jobs/Exceptions.vb

@@ -17,7 +17,7 @@ Public Class Exceptions
         Inherits ApplicationException
 
         Public Sub New()
-            MyBase.New()
+            MyBase.New("More than one ZUGFeRD document found")
         End Sub
     End Class
 
@@ -25,7 +25,7 @@ Public Class Exceptions
         Inherits ApplicationException
 
         Public Sub New()
-            MyBase.New()
+            MyBase.New("No ZUGFeRD documents found")
         End Sub
     End Class
 End Class