Fixes issue #11729. Close relative of issue #10956.
It is possible for us to receive Glyphs from the server that are valid, but have an invalid bitmap. In that case, the glyphs will be present in the `GlyphMap` used for shaping, but not present in the `GlyphPositions` used in `getGlyphQuads`. `SymbolInstance::hasText` looked at the shaping instead of the actual quads.
`symbol_projection.cpp` should never try to project a label without any quads, but we'll also try to make it so that it doesn't crash if it does.
b414c607c3