code: public AddOnClassnames getExtensionAddOnClassnames(String classname) {
  		if (extensionsWithDeps.isEmpty() || classname == null || classname.isEmpty()) {
  			return AddOnClassnames.ALL_ALLOWED;
  		}
  
  		for (ExtensionWithDeps extension : extensionsWithDeps) {
  			if (classname.equals(extension.getClassname())) {
  				return extension.getAddOnClassnames();
  			}
  		}
  		return AddOnClassnames.ALL_ALLOWED;
  	}
docs: Returns the classnames that can be loaded for the given {@code Extension} (with dependencies).
  
  @param classname the classname of the extension
  @return the classnames that can be loaded
  @since 2.4.3
  @see #hasExtensionsWithDeps()