Allow merge method to accept null as argument to prevent exception

[ampedweb]

This was something I came across while using this filter in conjunction with the Symfony UX Twig Components
https://symfony.com/bundles/ux-twig-component/current/index.html#cva-and-tailwind-css

I found that if I used the filter like this attributes.render('class')|tailwind_merge and render('class') ended up returning null it results in a crash.

You can work around this by using null coalesce like attributes.render('class') ?? ''|tailwind_merge but this feels a bit cumbersome when using it in quite a few places throughout a component.

It feels like simply allowing null as an accepted argument type and letting it return an empty string is sensible rather than throwing a type exception.

Would be interested to know your thoughts on this. 🙂 Thanks!

[ker0x]

Not much to say, I'm ok with those changes 👌 ! Thanks