MadGridList gutterSize at 0

[isametal88]

Bug, feature request, or proposal:
Bug

What is the expected behavior?
A coherent use of the property

What is the current behavior?
The component is not handling in a coherent way the gutterSize property.
Starting with a numeric positive value, it works.
Starting with 0 as a number, nothing is being rendered, while it is if the starting configuration is '0px'. Binding the value to a model, the behaviour is strange:

starting from 1 and going to 0, nothing happens.

Moving from 0 to -1, the gutter is removed.

Going back to 0 nothing changes

Going back to 1 the gutter is properly restored.

What are the steps to reproduce?
https://stackblitz.com/edit/angular-material2-issue-gxfazr

What is the use-case or motivation for changing an existing behavior?
I'm building a nested grid, and I need to set the gutterSize to 0 in order to keep everything in the right place.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?
Angular 7.0.0
Angular Material 7.0.0
OS: Windows 10
Browser: Chrome

Is there anything else we should know?
Issue supposed to be closed in #13652 (I opened #13647 )

[crisbeto]

The issue is fixed by #13652 in 7.0.1. By the looks of it, you're running 7.0.0.

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