edge case

app.py

@@ -54,11 +54,11 @@ def process_ocr_qa(text, lang_choice):
                 k = len(known_tokens)
                 u = len(unknown_tokens)
                 total = k + u
-                ratio = f"{k}/{total}" if total > 0 else "0/0"
+                ratio = f"{k}/{total}" if total > 0 else "n/a"
             
                 score_emoji = "🟢" if score >= 0.8 else "🟡" if score >= 0.5 else "🔴"
                 output_lines.append(
-                    f"{score_emoji} Quality Score: {score}  ({ratio})"
+                    f"{score_emoji} Quality Score: {score if total else 'n/a'}  ({ratio})"
                 )