-awakeFromNib nils out the styleURL property to ensure a style is always present on load. However, if the style URL is specified in the Style URL inspectable, it is set somewhere between -initWithCoder: and -awakeFromNib; nilling out the styleURL property in -awakeFromNib thus resets the style to the default. This change guards against nilling out a non-nil style URL, ensuring that -setStyleURL: is called once and only once on launch.
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