Don't overwrite existing value if set
Don't overwrite existing value if set

aleitner/libstorj-c,Storj/libstorj-c,braydonf/libstorj,braydonf/libstorj-c,aleitner/libstorj-c,braydonf/libstorj-c,braydonf/libstorj,Storj/libstorj-c