Invalid schema sometimes generates an alias error

[jonurry]

If you pass in an undefined schema value to the generator then it fails to extract an alias and errors with the message:

TypeError: Cannot destructure property alias of 'undefined' or 'null'.

Also happens if you set a default value of null for an input.

To fix this in the generateInputSchema function in generateInputSchema.js:

change:

// deep map change keys to aliases
const aliasedSchema = deepMapKeys(mappedSchema, (key, value) => {
	const { alias } = value;
	return alias || key;
});

to

// deep map change keys to aliases
const aliasedSchema = deepMapKeys(mappedSchema, (key, value) => {
	const { alias } = value || {};
	return alias || key;
});

by adding || {} to const { alias } = value