Fix ES test connection
Fix ES test connection

Error was being created, but not returned. Which caused it
to always display as success.

M32Media/redash,EverlyWell/redash,44px/redash,crowdworks/redash,imsally/redash,amino-data/redash,imsally/redash,stefanseifert/redash,alexanderlz/redash,chriszs/redash,denisov-vlad/redash,useabode/redash,chriszs/redash,moritz9/redash,rockwotj/redash,EverlyWell/redash,chriszs/redash,amino-data/redash,useabode/redash,chriszs/redash,44px/redash,stefanseifert/redash,stefanseifert/redash,amino-data/redash,getredash/redash,rockwotj/redash,vishesh92/redash,vishesh92/redash,imsally/redash,imsally/redash,getredash/redash,hudl/redash,getredash/redash,stefanseifert/redash,vishesh92/redash,EverlyWell/redash,rockwotj/redash,vishesh92/redash,denisov-vlad/redash,denisov-vlad/redash,crowdworks/redash,amino-data/redash,moritz9/redash,EverlyWell/redash,alexanderlz/redash,M32Media/redash,alexanderlz/redash,rockwotj/redash,M32Media/redash,denisov-vlad/redash,moritz9/redash,hudl/redash,44px/redash,crowdworks/redash,M32Media/redash,alexanderlz/redash,hudl/redash,getredash/redash,crowdworks/redash,useabode/redash,useabode/redash,denisov-vlad/redash,hudl/redash,getredash/redash,moritz9/redash,44px/redash,stefanseifert/redash