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Automatic update from web-platform-tests font: Properly handle when shaping produces no glyphs When shaping produces no glyphs, which can happen when a zero-width space is shaped for a font that has no space or zero-width space glyph, just return an empty `ShapedText` instead of trying to process any glyphs. This prevents logic issues due to the rest of the code assuming there are glyphs. Signed-off-by: Martin Robinson <[email protected]> -- wpt-commits: 29d68481be3a91230201a37951bd5c94724f59b3 wpt-pr: 60200