relax getter on loading

[dohomi]

Trying to solve #212 and probably some other issues where loading of undefined appears on Nuxtjs with child routes

@Akryum I'm not sure if this will solve the issue but I face exactly the issue where a getter on loading is called even though the queries is empty. I have this issue on call of historyBack() from child route back to parent page.

[dohomi]

@Akryum so I tried now more extensively this PR in my current app and it fixes at least #212 but I'm not sure about side-effects.

The major issue I came across working with vue-apollo and Nuxt with the apollo-module is, that on state changes and historyBack() or routing on the same component with route.params you get your application into a state, where $apollo.queries is empty and thus you end up in undefined code and data is not properly set.

I am not sure how to really solve this issue. In my opinion the main issue with vue-apollo is, that $apollo is only connected and accessible on the current this context of one component and not on $root. Maybe if smartQueries would be available through the whole application code then the issue could be solved.

[dohomi]

@Akryum did you got time to check this PR? its currently still an issue if the component structure is not cleaned up correctly that you bump into the #212 issue.

[rhangai]

I also have this problem, but the fixes proposed in this PR solves it perfectly. (And i think #266 is related)
This happens when i use nested routes.

[Akryum]

Thanks! 👍