Error in brapi_post_variables when giving only one contextOfUse

[aliceboizet]

I tried adding a new variable with this function :
v <- brapirv2::brapi_post_variables( con, contextOfUse = c("MEANS"), method = list(methodDbId = methodDbId), observationVariableName = observationVariableName, trait = list(traitDbId = traitDbId) )

I got an error 400 because the body sent to the BrAPI server wasn't in the right format, with
"contextOfUse": "MEANS" instead of "contextOfUse": ["MEANS"]

It works fine if "contextOfUse" contains more than one element.
I managed to fix this by adding the pattern "contextOfUse" in line 29 of brapi_POST_callBody function.