Abort ignored filename suffix stripping early on unworkable filenames

src/assets.rs

@@ -291,12 +291,13 @@ impl HighlightingAssets {
                         .and_then(|x| x.to_str())
                         .unwrap_or_default(),
                 ).or_else(|| {
-                    let file_str = file_path.to_str().unwrap_or_default();
+                    if let Some(file_str) = file_path.to_str() {
                         for suffix in IGNORED_SUFFIXES.iter() {
                             if let Some(stripped_filename) = file_str.strip_suffix(suffix) {
                                 return self.get_extension_syntax(OsStr::new(stripped_filename));
                             }
                         }
+                    }
                     None
                 })
             })