Feat: return empty fig

recopytex/dashboard/exam_analysis/app.py

@@ -240,7 +240,7 @@ def update_final_scores_hist(data):
     assessment_scores = pd.DataFrame.from_records(data)
 
     if assessment_scores.empty:
-        return [{"data": [], "layout": []}]
+        return [go.Figure(data=[go.Scatter(x=[], y=[])])]
 
     ranges = np.linspace(
         -0.5,
@@ -287,7 +287,7 @@ def update_competence_fig(data):
     scores = flat_df_students(scores).dropna(subset=["Score"])
 
     if scores.empty:
-        return [{"data": [], "layout": []}]
+        return [go.Figure(data=[go.Scatter(x=[], y=[])])]
 
     scores = pp_q_scores(scores)
     pt = pd.pivot_table(