Guard against missing siblings on the styles demo page - #448
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sibling() returns false for the first and last style in the demo list, and assign_details() read the url and id from it anyway. Harmless on production where the notice is suppressed, but any board running with DEBUG gets an error page instead of the demo.
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Fixes #447
sibling() returns false for the first and last style in the demo list, and assign_details() read the url and id from it anyway. The prev and next arrows now fall back to their disabled state.