Python syntax warning upon installation

[sm8ps]

After issuing sudo apt install manuskript on Ubuntu 20.04, I see the following warning

manuskript (0.10.0-1) wird eingerichtet ...
/usr/share/manuskript/manuskript/exporter/pandoc/abstractPlainText.py:78: SyntaxWarning: "is" with a liter
al. Did you mean "=="?
  if self.formats is "":
/usr/share/manuskript/manuskript/importer/opmlImporter.py:124: SyntaxWarning: "is" with a literal. Did you
 mean "=="?
  return len(s) is 0
/usr/share/manuskript/manuskript/main.py:104: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if platform.system() is not 'Windows':

This looks like a typo to me as it is not valid Python syntax. At least the first one still is present in the current code (version 0.11) on Github.

[gedakc]

See PR #762 for a fix for this problem.