protractorAdapter: $ is broken - alway throws NoElementWithLocatorError

[hepiyellow]

The bug is here:

unidriver/adapters/protractor/src/index.ts

Line 83 in 5c5a091

if (!elGetters.length) {

elGetters is actually a Protractor ElementArrayFinder.
Which doesn't have a length property.
We should use count().

Why we haven't noticed this

• There are no tests for protractor adapter
• Protractor type for ElementArrayFinder allows any keys using:

     [key: string]: any;