Adjust logic for setting implicit complement in entHandles

src/dagmc/DagMC.cpp

@@ -924,19 +924,18 @@ ErrorCode DagMC::build_indices(Range& surfs, Range& vols) {
   //   be checked before the implicit complement
   EntityHandle implicit_complement {0};
   rval = geom_tool()->get_implicit_complement(implicit_complement);
-  if (rval != MB_SUCCESS || implicit_complement == 0) {
-    logger.message("Could not get the implicit complement");
-    return rval;
-  }
-  auto it = std::find(vol_handles().begin(), vol_handles().end(), implicit_complement);
-  if (it != vol_handles().end()) {
-    vol_handles().erase(it);
-  }
-  else {
-    logger.message("Could not find the implicit complement in the volume handles vector");
-    return MB_FAILURE;
+  if (rval == MB_SUCCESS && implicit_complement != 0) {
+    auto it = std::find(vol_handles().begin(), vol_handles().end(), implicit_complement);
+    if (it != vol_handles().end()) {
+      vol_handles().erase(it);
+    }
+    else {
+      logger.message("Could not find the implicit complement in the volume handles vector");
+      return MB_FAILURE;
+    }
+    // insert the implicit complement at the end of the vector
+    vol_handles().push_back(implicit_complement);
   }
-  vol_handles().push_back(implicit_complement);
 
   idx = 1;
   for (auto vol_handle : vol_handles()) {