Update uploads.py

uploads.py

@@ -25,7 +25,7 @@ def model_hyperlink(link, model_name):
 
 def input_verification(model, model_family, forget_rate, url, path_to_file, organisation, mail):
     for input in [model, model_family, forget_rate, url, organisation]:
-        if input is "":
+        if input == "":
             return format_warning("Please fill all the fields.")
     
     # Very basic email parsing