Frozen Rows returns error when there's no data.

[kiwon34]

From the demo, 'Frozen Rows', I found out that if I put no data, set option to frozenRows:2, and run demo, I get "Cannot read property 'pq_hidden' of undefined" message, and then it stops drawing the grid.
I found out the error occurs at line 9969 in pqgrid.dev.js.
I can fix this by myself, but wanted to make sure if this is an intended error and I should not use it this way.

[paramvir]

That is not intended error, thanks for reporting it.