The function returns a TEXT representing the user name of the Assign to project role, playing project role with name projectRoleName in the current issue's project, or ""
if no default user is defined for the project role.
defaultUserForRole(text projectRoleName) #Output: Text
The function returns a TEXT equivalent to the previous function but with extra argument projectKey for selecting the project argument projectRoleName refers to.
defaultUserForRole(text projectRoleName, text projectKey) #Output: Text