fix bug where json parsing barfs because we aren't setting a value which is actually json.
fix bug where json parsing barfs because we aren't setting a value which is actually json.

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