White screen when story has no design config

[Romanchuk]

Storybook: 5.3.8
storybook-addon-designs: 5.1.1

Exception occurs when you click on Design panel if story has no design config (user sees white screen).

Uncaught TypeError: Cannot use 'in' operator to search for 'length' in undefined

Group of stories decorated "withDesign", but story some stories has no design config.

storiesOf('Controls', module)
	.addDecorator(withKnobs({ escapeHTML: false }))
	.addDecorator(withThemes(THEMES))
	.addDecorator(withDesign)
	.add('Checklists', data => {
		return {
..

http://joxi.ru/D2PKWaaSqxPGzm

I suggest to hide "Design" button if there is no design config in story or handle this exception to avoid braking the whole storybook.

[Romanchuk]

i see in code you have:

skipIfNoParameterOrOptions: true

But no code references to it

[pocka]

thanks, turned out it's a typo 😦

- skipIfNoParameterOrOptions
+ skipIfNoParametersOrOptions

[pocka]

Fixed in v5.1.2

[Romanchuk]

Thanks, now it works!