Re: [csswg-drafts] [css-grid] Should grid-template-areas accept empty strings? (#5110)

@tabatkins : just to be sure we're understanding... 

Can you clarify which of these values should be considered invalid:
```css
grid-template-areas: "";
grid-template-areas: "" "";
grid-template-areas: "foo" "";
```

Are all three invalid? (I think that would make sense, and it's how Mats has implemented the change, but I'm not sure it agrees with your "must define at least one *cell*" phrasing above... It sounds like your phrasing might allow the third example here.)

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