Add return to the wrapper for save

Save mistakenly removed the return function when a wrapper was added for it. This has created downstream issues, including preventing PUT requests through the API.

frappe/model/document.py

@@ -239,7 +239,7 @@ class Document(BaseDocument):
 
 	def save(self, *args, **kwargs):
 		"""Wrapper for _save"""
-		self._save(*args, **kwargs)
+		return self._save(*args, **kwargs)
 
 	def _save(self, ignore_permissions=None):
 		"""Save the current document in the database in the **DocType**'s table or
@@ -985,4 +985,4 @@ def execute_action(doctype, name, action, **kwargs):
 		doc.add_comment('Comment',
 			_('Action Failed') + '<pre><code>' + frappe.get_traceback() + '</pre></code>')
 
-		doc.notify_update()
+		doc.notify_update()