Input Validator for Min/Max Quantities
My site is a multivendor marketplace, and some users mistakenly put in 0 for minimum, maximum, and/or group of quantities - this caused both issues with checkout and more importantly a fatal PHP error when the plugin attempted to run the check on line 675 for if the min/max quantities are divisible by the group of.
I'm requesting a validator be added to the plugin to prevent 0 from being added.
