remove default value for assignee field and set to unassigned.
remove default value for assignee field and set to unassigned.

git-jls/brimir,fiedl/brimir,git-jls/brimir,viddypiddy/brimir,viddypiddy/brimir,git-jls/brimir,fiedl/brimir,ivaldi/brimir,fiedl/brimir,viddypiddy/brimir,ivaldi/brimir,viddypiddy/brimir,git-jls/brimir,fiedl/brimir,ivaldi/brimir,ivaldi/brimir