Own Error handler if given data is invalid

[jase88]

Is your feature request related to a problem? Please describe. Currently squirrelly throws an exception if invalid data has been passed toSqrl.render, which is totally fine as default.

Describe the solution you'd like It would be great to have the possibility to define a custom error handler, which might return a result instead of throwing

e.g.

Sqrl.render('Hello {{person.name}}', {person: null}, {useWith: true});
Sqrl.render('{{greeting}} {{person.name}}', {greeting: 'Hello'}, {useWith: true});

-> could both return 'Hello '

[nebrelbug]

@kerosin great question! Some simple error handling is possible with the try helper.

See https://runkit.com/nebrelbug/squirrelly-try-catch for an example :)