Enhance load_file function to ensure proper handling of unnamed columns by checking if the column name is a string before dropping. This improves data integrity during file uploads.

global_func/load_file.py

@@ -106,7 +106,7 @@ def load_file(upload, site_var, type_var, sport_var, upload_type):
                     return None, None
             
             for col in df.columns:
-                if "Unnamed" in col:
+                if isinstance(col, str) and "Unnamed" in col:
                     df = df.drop(columns=[col])
 
             if upload_type == 'portfolio':