The missing texture is displayed if summoning a mannequin with an invalid cape texture

If a mannequin is summoned such that its cape parameter does not point to an existing or valid texture file, the missing texture will be displayed. This probably should not happen; this texture being displayed most often indicates an issue with the active resource pack.

Command to reproduce: /summon minecraft:mannequin ~ ~ ~ {profile:{texture:"entity/player/wide/kai",cape:"invalidcapetexture"}}

Expected behaviour: no cape would be displayed, as though no cape parameter was provided.

Actual results: a cape is displayed with the missing texture.