Replace exception with warning for missing wafer in module mapping

L1Trigger/L1THGCal/plugins/geometries/HGCalTriggerGeometryV9Imp2.cc

@@ -61,8 +61,9 @@ class HGCalTriggerGeometryV9Imp2 : public HGCalTriggerGeometryBase {
   edm::FileInPath l1tLinksMapping_;
 
   // module related maps
-  std::unordered_map<unsigned, unsigned> wafer_to_module_;
-  std::unordered_multimap<unsigned, unsigned> module_to_wafers_;
+  // declared mutable to be able to cache missing modules
+  mutable std::unordered_map<unsigned, unsigned> wafer_to_module_;
+  mutable std::unordered_multimap<unsigned, unsigned> module_to_wafers_;
   std::unordered_map<unsigned, unsigned> links_per_module_;
 
   // Disconnected modules and layers
@@ -270,11 +271,15 @@ unsigned HGCalTriggerGeometryV9Imp2::getModuleFromTriggerCell(const unsigned tri
       unsigned layer_with_offset = layerWithOffset(trigger_cell_id);
       auto module_itr = wafer_to_module_.find(packLayerWaferId(layer_with_offset, waferu, waferv));
       if (module_itr == wafer_to_module_.end()) {
-        throw cms::Exception("BadGeometry")
-            << trigger_cell_trig_id << "HGCalTriggerGeometry: Wafer (" << waferu << "," << waferv
-            << ") is not mapped to any trigger module. The module mapping should be modified. \n";
+        edm::LogWarning("HGCalTriggerGeometry") << "Found missing wafer (layer=" << layer_with_offset << " u=" << waferu
+                                                << " v=" << waferv << ") in trigger modules mapping";
+        // Fill missing modules as disconnected (id=0) in the mapping
+        module = 0;
+        wafer_to_module_.emplace(packLayerWaferId(layer_with_offset, waferu, waferv), module);
+        module_to_wafers_.emplace(packLayerModuleId(layer_with_offset, module), packWaferId(waferu, waferv));
+      } else {
+        module = module_itr->second;
       }
-      module = module_itr->second;
     }
     module_id =
         HGCalDetId((ForwardSubdetector)subdet_old, zside, layer, tc_type, module, HGCalDetId::kHGCalCellMask).rawId();