code: @Nullable
    public static final <T extends AbstractGlobalWebSingleton> T getGlobalSingletonIfInstantiated (@Nonnull final Class <T> aClass)
    {
      return getSingletonIfInstantiated (_getStaticScope (false), aClass);
    }
docs: Get the singleton object if it is already instantiated inside the current
  global web scope or <code>null</code> if it is not instantiated.
  
  @param <T>
  The type to be returned
  @param aClass
  The class to be checked. May not be <code>null</code>.
  @return The singleton for the specified class is already instantiated,
  <code>null</code> otherwise.