Initial filtering expressions on grid with no columns throws an error

[mddragnev]

1. Open the demo sample.
2. Set the columns to empty array
3. Set a filtering expression to the grid.

This is kind of important because this issue reproduces in the new angular wrapper. For some reason, the columns are initialized after the filtering expression is set. Thus, in Angular an error is thrown even with declared columns in the template. Note that the initial sorting works fine.

[mddragnev]

@damyanpetev @dkamburov FYI