Fix searching for 0 results with ftest framework

Using plugin-web-ui ftest framework to do search tests, if we expect that a search retrieves 0(zero) results, even when we have results the test will always pass

How to reproduce

• use search.feature to test a search
• make a search where the expected result is more than 0
• in the test make the expected result = 0 resultsCount
• test will pass(error)