python 3.8 bugs in hplip / focal upgrade

[Harry Coin]

/usr/share/hplip/base/utils.py:2063: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if weburl is "" or weburl is None:
/usr/share/hplip/check-plugin.py:116: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if log_level is 'debug':
/usr/share/hplip/check.py:685: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if 'getfacl' not in g and '' is not g and 'file' not in g:
/usr/share/hplip/installer/core_install.py:2037: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if home_dir is "":
/usr/share/hplip/ui5/devmgr_ext.py:15: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if self.latest_available_version is not "":
/usr/share/hplip/ui5/devmgr_ext.py:37: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if self.latest_available_version is not "":