Fix commit d703119d3a313a406482b121ee94c6afee3bc307 :
Some engines need to parse the HTTP error but
raise_for_error is always set to False in the "request" function.
the query "time" is convinient because most of the search engine will return some results,
but some engines in the general category will return documentation about the HTML tags <time> or <input type="time">
see searx.search.processors.abstract.EngineProcessor
First the method searx call the get_params method.
If the return value is not None, then the searx call the method search.
