diff --git a/qutebrowser/browser/commands.py b/qutebrowser/browser/commands.py
index f3f12acba..b6e4a2211 100644
--- a/qutebrowser/browser/commands.py
+++ b/qutebrowser/browser/commands.py
@@ -975,12 +975,12 @@ class CommandDispatcher:
             self._tab_focus_last()
             return
         index = count if count is not None else index
+
         if index is None:
             self.tab_next()
             return
         elif index == 0:
             index = self._count()
-
         elif index < 0:
             index = self._count() + index + 1
 
diff --git a/tests/unit/commands/test_cmdutils.py b/tests/unit/commands/test_cmdutils.py
index 264da8087..aaf63014e 100644
--- a/tests/unit/commands/test_cmdutils.py
+++ b/tests/unit/commands/test_cmdutils.py
@@ -431,7 +431,6 @@ class TestArgument:
                 pass
 
         expected = "zero_count argument cannot exist without count!"
-
         assert str(excinfo.value) == expected
 
     def test_no_docstring(self, caplog):