isValid_xxx_project, the project subject is actually an internal class so these calls made nothing

src/ce_dubproject.pas

@@ -690,7 +690,6 @@ begin
   // avoid the project to notify the observers, current project is not replaced
   EntitiesConnector.beginUpdate;
   maybe := TCEDubProject.create(nil);
-  EntitiesConnector.removeSubject(maybe);
   try
     try
       maybe.loadFromFile(filename);

src/ce_nativeproject.pas

@@ -931,7 +931,6 @@ begin
   // avoid the project to notify the observers, current project is not replaced
   EntitiesConnector.beginUpdate;
   maybe := TCENativeProject.create(nil);
-  EntitiesConnector.removeSubject(maybe);
   try
     maybe.loadFromFile(filename);
     result := maybe.hasLoaded;