trim query to prevent redundant search on empty query #927

Job	Run time
build-client / build-client	11m 26s
setup-selenium / setup_chromedriver	9s
Test (3.8, 0)	41m 49s
Test (3.8, 1)	52m 31s
Test (3.8, 2)	49m 59s
	2h 35m 54s

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