fix: annotator statistics dont crash if all scores are zero (#543)

src/encord_active/app/common/components/annotator_statistics.py

@@ -13,15 +13,20 @@
 def render_annotator_properties(df: DataFrame[MetricSchema]):
     annotators = get_annotator_level_info(df)
     if len(annotators) == 0:
+        st.warning("Found no annotators")
         return
 
-    left_col, right_col = st.columns([2, 2])
+    annotators_df = pd.DataFrame(list(annotators.values()))
+    total_annotations = annotators_df["total_annotations"].sum()
+    if not total_annotations:
+        st.warning("No annotations to show")
+        return
 
+    left_col, right_col = st.columns([2, 2])
     # 1. Pie Chart
     left_col.markdown(
         "<h5 style='text-align: center; color: black;'>Distribution of annotations</h1>", unsafe_allow_html=True
     )
-    annotators_df = pd.DataFrame(list(annotators.values()))
 
     fig = px.pie(annotators_df, values="total_annotations", names="name", hover_data=["mean_score"])
 
@@ -32,14 +37,12 @@ def render_annotator_properties(df: DataFrame[MetricSchema]):
         "<h5 style='text-align: center; color: black;'>Detailed annotator statistics</h1>", unsafe_allow_html=True
     )
 
-    total_annotations = annotators_df["total_annotations"].sum()
     total_mean_score = (annotators_df["mean_score"] * annotators_df["total_annotations"]).sum() / total_annotations
 
     info = AnnotatorInfo(name="all", total_annotations=total_annotations, mean_score=total_mean_score)
     annotators_df = pd.concat([annotators_df, pd.Series(info).to_frame().T], ignore_index=True)
 
-    deviation = (annotators_df["mean_score"] - total_mean_score) / total_mean_score * 100
-    annotators_df["deviation"] = deviation
+    annotators_df["deviation"] = (annotators_df["mean_score"] - total_mean_score) / (total_mean_score or 1) * 100
 
     right_col.dataframe(annotators_df.style.pipe(make_pretty), use_container_width=True)