Additional check for this.store to prevent undefined error at this.store[o].networkStatus=t.NetworkStatus.ready

[i6mi6]

This check is necessary, because sometimes a component gets mounted, request is fired, then the component gets unmounted (perhaps by user) and this.store becomes undefined, which causes the request handling to fail at this.store[queryId].networkStatus = complete with undefined is not an object, as we only check if (!this.store[queryId]) return; but instead we should check if (!this.store || !this.store[queryId]) return;

[apollo-cla]

@i6mi6: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Meteor Contributor Agreement here: https://contribute.meteor.com/

[hwillson]

Making things more defensive sounds good to me. Thanks @i6mi6!