add unit test which parses the response from hex, ie. containing a real null value
simplify get_null() method, it only returns 1 character, but 2 characters are calculated
* Accept remote without HEAD
* Update src/git/zcl_abapgit_git_branch_list.clas.testclasses.abap
Co-authored-by: Lars Hvam <larshp@hotmail.com>
Co-authored-by: Lars Hvam <larshp@hotmail.com>