Fixed potential bug when preloadResources called multiple times on one resource loader
Fixed potential bug when preloadResources called multiple times on one resource loader

qqquinta/nimx,rrenderr/nimx,bogdan-voevoda/nimx,rrenderr/nimx,yglukhov/nimx,yglukhov/nimx,bogdan-voevoda/nimx,bogdan-voevoda/nimx,qqquinta/nimx,rrenderr/nimx,qqquinta/nimx,yglukhov/nimx