forbid adding reactions with the same id

model/src/main/java/lcsb/mapviewer/model/map/model/ModelFullIndexed.java

@@ -173,6 +173,9 @@ public class ModelFullIndexed implements Model {
   @Override
   public void addReaction(Reaction reaction) {
     modelData.addReaction(reaction);
+    if (reactionByReactionId.get(reaction.getIdReaction()) != null) {
+      throw new InvalidArgumentException("Reaction with id already exists: " + reaction.getElementId());
+    }
     reactionByReactionId.put(reaction.getIdReaction(), reaction);
     reactionByDbId.put(reaction.getId(), reaction);
   }