See if a given category, namespace, name combination exists in the registry
    category - See registrycategories.  Type of module
    namespace - Namespace of the module, defined in settings
    name - the lowercase name of the module

def exists_in_registry(category, namespace, name):
    """
    See if a given category, namespace, name combination exists in the registry
    category - See registrycategories.  Type of module
    namespace - Namespace of the module, defined in settings
    name - the lowercase name of the module
    """
    selected_registry = [re for re in registry if re.category==category and re.namespace==namespace and re.name == name]
    if len(selected_registry)>0:
        return True
    return False