id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
32108	Allowing null values while registering function on transaction on_commit	Shagun Khemka	Herbert Poul	"So if I were to try this command:-

`transaction.on_commit(None)`

and run any sample tests which has simple django db post_save signal in the flow and it has functions which run on transaction commit, the code would crash with error

`TypeError: 'NoneType' object is not callable`. 

So how about if we do not allow it to register as none beforehand or allow it to exit gracefully?"	Cleanup/optimization	closed	Database layer (models, ORM)	2.2	Normal	fixed	DjangoORM Transaction		Ready for checkin	1	0	0	0	1	0