fix expansion of all-nil clauses in Query Expander
fix expansion of all-nil clauses in Query Expander

jonasdiel/metabase-ptBR,blueoceanideas/metabase,zoowii/metabase,jonasdiel/metabase-ptBR,zoowii/metabase,jonasdiel/metabase-ptBR,Endika/metabase,lukaswelte/metabase,dashkb/metabase,dashkb/metabase,jonasdiel/metabase-ptBR,Endika/metabase,zoowii/metabase,dashkb/metabase,lukaswelte/metabase,lukaswelte/metabase,Endika/metabase,jonasdiel/metabase-ptBR,zoowii/metabase,lukaswelte/metabase,dashkb/metabase,blueoceanideas/metabase,Endika/metabase,blueoceanideas/metabase,Endika/metabase,blueoceanideas/metabase,lukaswelte/metabase,zoowii/metabase,dashkb/metabase,blueoceanideas/metabase