Vuu server resends existing rows after a filter is created

When client sends a filter request with a CHANGE_VP message, expected response would be an ACK (CHANGE_VP_SUCCESS) , followed by TABLE_ROWS with filtered results.

What seems to happen is
1) client sends CHANGE_VP
2) server sends CHANGE_VP_SUCCESS
3) server sends TABLE_ROWS with no filter applied, i/e same set of rows it has previously sent
4) server sends TABLE_ROWS with filtered rows

step 3) is obviously redundant and adds delay to rendering of correct results in UI