Simplify logic operation

Co-authored-by: 🇺🇦 Sviatoslav Sydorenko (Святослав Сидоренко) <wk.cvs.github@sydorenko.org.ua>

Author: rffontenelle

noxfile.py

@@ -113,5 +113,5 @@ def sphinx_lint(session):
     accepting another path as positional argument.
     """
     session.install("sphinx-lint==1.0.0")
-    target = session.posargs if len(session.posargs) >= 1 else ["source"]
+    target = session.posargs or ["source"]
     session.run("sphinx-lint", *target)