Function allNil

allNil(objects?): boolean
Returns whether all the elements in the given objects are null or undefined
Parameters
- Optionalobjects: any[]
  the objects to check
Returns boolean
whether all the elements in the given objects are null or undefined
Example
```
allNil([null, undefined]);    // true
allNil([null, {}]);    // false
allNil([null, 'foobar']);    // false
```