do not show meaningless message when KWS yield no result

* hide the 'Did you mean any of the queries below?' when there is no KWS results
  - e.g. with query 'andrey' on global dbs
* also hide useless 'Coloring of query suggestions' as there are no suggestions
Merge pull request #4116 from dmwm/kws_when_no_results

do not show meaningless message when KWS yield no result