markFeatureWriter: Fix test failures

Check `key` is not empty before accessing first character.
googlefonts · Sep 4, 2024 · 6466a34 · 6466a34
1 parent baac9d9
commit 6466a34
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Lib/ufo2ft/featureWriters/markFeatureWriter.py b/Lib/ufo2ft/featureWriters/markFeatureWriter.py
@@ -162,7 +162,7 @@ def parseAnchorName(
     else:
         isMark = False
 
-    isIgnorable = not key[0].isalpha()
+    isIgnorable = key and not key[0].isalpha()
 
     return isMark, key, number, isContextual, isIgnorable