GH-156 Create new queue if null queue

[jamesmontemagno]

via: https://stackoverflow.com/questions/33642590/nsoperationqueue-currentqueue-not-working

Description of Change

If the current queue is null because it is being called from an outside context then create a new one :)

Bugs Fixed

• Related to issue [iOS] NullRef with sensors on background thread #156

PR Checklist

• Has tests (if omitted, state reason in description)
• Has samples (if omitted, state reason in description)
• Rebased on top of master at time of PR
• Changes adhere to coding standard
• Updated documentation (see walkthrough)

[mattleibow]

We just have to remember (or maybe make a note) that this is going to fail:

var myThing = DoSomething(Platform.CurrentQueue);

if (myThing.Queue == Platform.CurrentQueue) {
    // in my mind
} else {
    // say whaa?!?
}

[mattleibow]

Maybe we should change this from a property to a method like Platform.GetQueue() or something that indicates that it does not return the same object in some cases.

[mattleibow]

But, this is internal so a comment may be just fine as well.

[jamesmontemagno]

yeah, i like get queue so it doesn't think it is always the same. Good call.