Interpolation of an unset value prints "undefined"

Hello. While trying to implement value prefilling for my inputs I encountered many “undefined” values for unset variables.

Steps to reproduce:

1. Go to interactive examples https://eta.js.org/docs/examples/interactive
2. Change Eta.render('Hi <%= it.name %>', {name: 'Person'}) to Eta.render('Hi <%= it.name %>', {})
3. Press Run button. Result is “Hi undefined”.

It is very inconvenient to use something like <%= it.name || “” %> for each interpolation especially for input prefilling. So I think showing “” instead of “undefined” is more correct. EJS thinks the same way and renders "Hi " if I modify this example for it. However if it is intended and there is another way to interpolate undefined values as “” please add it to the documentation.

[AntonNech]

Thank you! Everything works great, no more “undefined”.

[willemmulder]

Yes, even better! Good thinking 👍