smaller fixes

Author: LaurenzV

src/render/text.rs

@@ -266,10 +266,9 @@ pub fn render(
                     continue;
                 };
 
-                let name = font_names.get(&font.reference).unwrap();
+                let name = font_names.get(&font.reference).ok_or(UnknownError)?;
 
-                // TODO: Remove unwraps and switch to error-based handling.
-                let cid = font.glyph_remapper.get(glyph.id.0).unwrap();
+                let cid = font.glyph_remapper.get(glyph.id.0).ok_or(UnknownError)?;
                 let ts = glyph
                     .outline_transform()
                     .pre_scale(font.units_per_em as f32, font.units_per_em as f32)