fix: tolerate missing Ortho DataLinks rows in DryRun

Plant3D2026/P_Rec_Annot/src/PRecAnnot.Plant3D2026/PlantReadPath.cs

@@ -164,6 +164,8 @@ internal sealed class PlantObjectReader : IPlantObjectReader
         if (dataLinks is null) return Array.Empty<PlantObjectSnapshot>();
 
         var snapshots = new List<PlantObjectSnapshot>();
+        try
+        {
             foreach (var rowId in dataLinks.SelectAcPpRowIds(document.Database))
             {
                 try
@@ -192,6 +194,12 @@ internal sealed class PlantObjectReader : IPlantObjectReader
                     // Keep the read path best-effort; no write operation is attempted.
                 }
             }
+        }
+        catch (DLException)
+        {
+            // An Ortho sheet can have no direct Piping DataLinks rows. The caller
+            // receives an empty read-only result rather than a command failure.
+        }
         return snapshots.OrderBy(x => x.SnapshotId, StringComparer.Ordinal).ToArray();
     }