getOption falsy key behavior differs from native js object

[taburetkin]

Description

the getOption method have falsy check for keyName and this may lead for some unexpected results.
link to source:

backbone.marionette/src/common/get-option.js

Line 7 in 0b38315

if (!optionName) { return; }

example:

const falsyKey = 0;
const view = new Mn.View({ [falsyKey]: 'some value' });
console.log(view.getOption(falsyKey)) // undefined;
console.log(view.options[falsyKey]) // somev value;

the codepen: https://codepen.io/dimatabu/pen/vYWwyMR?editors=0010

solution:

const getOption = function(optionName) {
-  if (!optionName) { return; }
+ if (!arguments.length) { return; }
};