Enhance error handling in `load_file.py` for lineup processing

- Added a check to ensure that the maximum number of players in any lineup is a positive integer, providing user feedback when no valid lineups are found in the uploaded file. This improves the robustness of the data loading process.

global_func/load_file.py

@@ -34,8 +34,12 @@ def load_file(upload):
             
             # Split into individual columns and remove position indicators
             # First, determine the maximum number of players in any lineup
-            max_players = df['Lineup'].str.split(',').str.len().max()
+            max_players = int(df['Lineup'].str.split(',').str.len().max())
             
+            if max_players <= 0:
+                st.error('No valid lineups found in the uploaded file')
+                return None
+                
             # Create columns for each player
             for i in range(max_players):
                 df[i] = df['Lineup'].str.split(',').str[i].str.strip()