Update app.py

app.py

@@ -134,13 +134,18 @@ if not df_binary.empty:
     df_robot = df_binary.copy()
     df_robot.insert(0, 'Sample', range(1, len(df_robot) + 1))
     df_robot['# donors'] = df_robot.iloc[:, 1:].astype(int).sum(axis=1)
-    df_robot['volume donors (µL)'] = 64 / df_robot['# donors']
+    df_robot['volume donors (µL)'] = df_robot['# donors'].apply(
+        lambda x: 64 / x if x > 0 else 0
+    )
+
 
     robot_script = []
     source_wells = generate_source_wells(df_robot.shape[1] - 1)
 
     for i, col in enumerate(df_robot.columns[1:]):
         for _, sample in df_robot.iterrows():
+            if sample['# donors'] == 0:
+                continue  # skip samples with no donors
             if int(sample[col]) == 1:
                 sample_id = int(sample['Sample'])
                 plate = get_plate_id(sample_id)