Replace falsy check of coordinates with proper numeric check

[benurb]

Hi,

there is a little problem with the check for the cropping parameters. It was doing a falsy check instead of a proper numeric check, so that the following config did not work, because of 0 for x/y resolving to false:

{
  name: "name",
  x: 0,
  y: 0,
  width: 100,
  height: 100
}

This PR fixes the check 😄

Best regards,
Ben

[christian-bromann]

Sorry for the delay. This looks good! Thanks