Update clients.py

clients.py

@@ -428,6 +428,10 @@ def display_analytics():
     
     # Calculate percentage change for each dataframe
     def calculate_percentage_change(df):
+        if df.empty or 'email_receiver' not in df.columns or 'week' not in df.columns:
+            df['Percentage Change'] = 'No Data'
+            return df
+        
         df = df.sort_values(by=['email_receiver', 'week'])  # Ensure data is sorted by week
         df['Percentage Change'] = df.groupby('email_receiver')['Total Companies/Executives engaged'].pct_change() * 100
         df['Percentage Change'] = df['Percentage Change'].fillna('No Data')  # Handle NaN values