Fix behavior when uploading no file in Zope >= 5.8.1. (#62)

Author: Michael Howitz

CHANGES.rst

@@ -4,6 +4,8 @@ Changelog
 5.1 (unreleased)
 ----------------
 
+- Fix behavior when uploading no file in ``Zope >= 5.8.1``.
+
 
 5.0 (2023-02-01)
 ----------------

src/Products/PythonScripts/PythonScript.py

@@ -179,12 +179,12 @@ def ZPythonScriptHTML_upload(self, REQUEST, file=''):
         if self.wl_isLocked():
             raise ResourceLockedError('The script is locked via WebDAV.')
 
+        if not file:
+            return self.ZPythonScriptHTML_editForm(
+                self, REQUEST,
+                manage_tabs_message='No file specified',
+                manage_tabs_type='warning')
         if not isinstance(file, str):
-            if not file:
-                return self.ZPythonScriptHTML_editForm(
-                    self, REQUEST,
-                    manage_tabs_message='No file specified',
-                    manage_tabs_type='warning')
             file = file.read()
 
         self.write(file)