fix: avoid nuxtContext in spa mode

[MartinMalinda]

Fixes #161

Not calling the setStateProvider() in case of missing nuxtContext seems like a safer approach, otherwise it errored out on undefined state provider in some next step.

[posva]

did you gave this a try in both universal and spa modes in nuxtconfig?

[MartinMalinda]

Without this fix: Cannot read property 'pinia' of undefined (in SPA mode)

With this fix:

[vue-composition-api] must call Vue.use(plugin) before using any function.

both (SPA and universal)

I guess this is becuase I tested via npm link. I'm not sure if I can test via pointing to github because dist is gitignored.

[posva]

to test locally with linking, you need to link both pinia and @vue/composition-api in your app as well as @vue/composition-api in pinia to make sure both pinia and your App use the same library. It's a bit... convoluted

[MartinMalinda]

@posva

OK, so I just retested with a manual change in node_modules and it seems to be working fine both in SPA and Universal

[posva]

Thanks!