Skip tooltips for missing scores

render.py

@@ -332,7 +332,9 @@ def _df_to_table(df: pd.DataFrame, bold_axis: int | None, empty: str) -> str:
             text = _fmt_value(row[col], is_score)
             cls = _cell_class(col, is_score, text is None)
             weight = ' style="font-weight:700"' if (idx, col) in bold else ""
-            guide = _score_guide(str(col), row) if is_score else None
+            guide = (
+                _score_guide(str(col), row) if is_score and text is not None else None
+            )
             shown = (
                 _model_cell_html(row[col])
                 if isinstance(row[col], ModelCell)