fix: prevents fatal crash on old model cards (#548)

* fix: prevents fatal crash on old model cards

* fix: formatting

---------

Co-authored-by: Claire Kuang <kuang.claire@gmail.com>
Co-authored-by: Oğuzhan Koral <45078678+oguzhankoral@users.noreply.github.com>

Connectors/Revit/Speckle.Connectors.RevitShared/Bindings/RevitSendBinding.cs

@@ -399,6 +399,11 @@ internal sealed class RevitSendBinding : RevitBaseBinding, ISendBinding
         viewFilter.SetContext(_revitContext);
       }
 
+      if (modelCard.SendFilter is null || modelCard.SendFilter.IdMap is null)
+      {
+        continue;
+      }
+
       var selectedObjects = modelCard.SendFilter.NotNull().IdMap.NotNull().Values;
       var intersection = selectedObjects.Intersect(objUniqueIds).ToList();
       bool isExpired = intersection.Count != 0;