Add a safeguard to do not use uninitialized value

apps/openmw/mwworld/store.cpp

@@ -355,12 +355,12 @@ namespace MWWorld
     template <class T, class Id>
     RecordId TypedDynamicStore<T, Id>::read(ESM::ESMReader& reader, bool overrideOnly)
     {
-        T record;
-        bool isDeleted = false;
         if constexpr (!ESM::isESM4Rec(T::sRecordId))
         {
+            T record;
+            bool isDeleted = false;
             record.load(reader, isDeleted);
-        }
+
             insert(record, overrideOnly);
 
             if constexpr (std::is_same_v<Id, ESM::RefId>)
@@ -368,6 +368,14 @@ namespace MWWorld
             else
                 return RecordId();
         }
+        else
+        {
+            std::stringstream msg;
+            msg << "Can not load record of type ESM::REC_" << getRecNameString(T::sRecordId).toStringView()
+                << ": ESM::ESMReader can load only ESM3 records.";
+            throw std::runtime_error(msg.str());
+        }
+    }
 
     // LandTexture
     //=========================================================================