[#42227623] refactored create label action -step 1

Instead of location use an existing labellable
object as a parameter of the create label action.
Spec is failing!!! Should correct it.
[#42227623] override empty? method on labellable

We are always return false, so the labellable
is never empty.
bump version to 0.21.1
Merge pull request #83 from maxigit/42227623_add_create_labels_spec_in_api

42227623 add create labels spec in api