Check if redirect_uri exists

[rono23]

Summary

When redirect_uri is nil, it raises an error like below.

ActionView::Template::Error (undefined method `split' for nil:NilClass):

Other Information

doorkeeper/lib/generators/doorkeeper/templates/migration.rb.erb

Lines 10 to 13 in 4c1a571

	# Remove `null: false` if you are planning to use grant flows
	# that doesn't require redirect URI to be used during authorization
	# like Client Credentials flow or Resource Owner Password.
	t.text :redirect_uri, null: false

[doorkeeper-bot]

	1 Warning
⚠️	There're library changes, but not tests. That's OK as long as you're refactoring existing code.

Generated by 🚫 Danger

[nbulaj]

LGTM

Could you please do what bot suggested? About changelog entry

[rono23]

I updated changelog!

[nbulaj]

Thanks @rono23 !