Ultimately the Duotone icon is different from the regular icon in only way: instead of single path it has array of paths in the icon definition. Now check uses this fact to decide whether error should be thrown.
Also fixes typo in the error message (fab -> fad).
Ultimately the Duotone icon is different from the regular icon in only way: instead of single path it has array of paths in the icon definition. Now check uses this fact to decide whether error should be thrown.
Also fixes typo in the error message (fab -> fad).