<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def normalize_nodes(*nodes, headers=None):
 """Normalizes given dict or array of driver nodes"""

    if not nodes:
        return (normalize_node(DEFAULT_NODE, headers),)

    normalized_nodes = ()
    for node in nodes:
        normalized_nodes += (normalize_node(node, headers),)
    return normalized_nodes