Arrange in Grid Component - 0 item in row freeze

[jkamm]

When the Arrange in Grid component tries to run with an input of "0" for Rows, the component freezes with no recovery (escape behavior) possible.

To recreate the bug:
add a valid input to the "G" input of the component.
add a 0 or negative number it the "I" input.

In the code for this component, (https://github.com/woodsbagot/WombatGH/blob/master/WombatGH/ArrangeInGrid.cs) it looks like the problem is that the for loop has escape behavior for 0 and negative values, but the while loop does not handle the condition where the for loop ends while the geoToTransform list still has items in it.

There are a few ways I can think of to solve this - set a minimum value of one for rowCount, add an error for ineligible values for rowCount, or add escape behavior for the loop (http://james-ramsden.com/you-should-be-implementing-esc-behaviour-in-your-grasshopper-development/). Don't know which one is most in keeping with the strategy of the WB code keepers.

Thanks!