Grid CellStyleGenerator Strange Behavior

Hi Guys,

I'm just doing some work with Grid styling, and finding its behaving a little different to Table styling and not sure if this is intended or a bug.

Here's what i'm seeing WITH TABLES.
If I do a Table.CellStyleGenerator where getStyle() returns "ok"
I see a style applied to the HTML as: v-table-cell-content-ok

Here's what i'm seeing WITH GRID.
If I do a Grid.CellStyleGenerator where getStyle() returns "ok"
I see the style applied to the HTML as: v-grid-cell ok (note the space).

I'm not sure if this style is intended to be applied standalone or not?  It's just different to the behavior of tables, so I just thought i'd check if this was intended behavior or if the "ok" should actually be appended to v-grid-cell style name.

Vaadin Version, Theme and Widgetset 7.4.3

Cheers,
~Ben

Just an additional update on this , now running Version 7.5.0.beta1 - and seeing the same behavior.

In addition to this, if getStyle() returns an empty string - "" - this crashes the browser. (Firefox)

If getStyle() returns null, it works fine.