code: def append_dev_version(release_version):
      """
      If dev version is not empty appends it to release_version.
      """
  
      dev_version_value = dev_version()
      if dev_version_value:
          return release_version + "-" + dev_version_value
      else:
          return release_version
  
label_desc: Use image node_id 2 for calling a global function with example usage: append_dev_version(release_version) and returns: unknown, release_version