The Light Domain Cleric Channel Divinity: Radiance of the Dawn has two effects:
As an action, you present your holy symbol, and any magical darkness
within 30 feet of you is dispelled.
Additionally, each hostile creature within 30 feet of you must make a Constitution saving throw.
Is the additional effect dependent upon the first effect? i.e. does the Channel Divinity require the presence of magical darkness within range before it can be used?