Merge pull request #15 in SSA/data from SSA-6319-null-executable to main

* commit '24dcfec0':
  Changed test naming convention. Added custom fixture for initializing Null object.
  Updated README with correct information.
  Added username/password collection to ensure a connection to builder.
  Changed import to work with conda build testing.
  Added dependency for transfer_to_builder
  Created unit tests.
  Fixed typo that was causing print_error to not run correctly.
  Removed pymygdala integration; made logging self-contained; added two more functions
  Fixed crash that would occur when a package has no requirements.
  Fixed bug in build_packages that would report package not valid when building it for the first time.
  Updated logging to use pymygdala's LogHandler class.
  First prototype of null executable.