Bump to 2.9.1

setup.py

@@ -20,7 +20,7 @@ elif (3, 0) < version < (3, 3):
           ' ({}.{} detected).'.format(*version))
     sys.exit(-1)
 
-VERSION = '2.9'
+VERSION = '2.9.1'
 
 install_requires = ['psutil', 'colorama', 'six', 'decorator']
 extras_require = {':python_version<"3.4"': ['pathlib']}

tests/test_types.py

@@ -44,6 +44,10 @@ class TestSortedCorrectedCommandsSequence(object):
         assert set(seq) == {CorrectedCommand('ls', priority=100),
                             CorrectedCommand('ls', side_effect, 300)}
 
+    def test_with_blank(self, settings):
+        seq = SortedCorrectedCommandsSequence(iter([]), settings)
+        assert list(seq) == []
+
 
 class TestCorrectedCommand(object):
 

thefuck/types.py

@@ -81,9 +81,10 @@ class SortedCorrectedCommandsSequence(object):
 
     def _realise(self):
         """Realises generator, removes duplicates and sorts commands."""
-        commands = self._remove_duplicates(self._commands)
-        self._cached = [self._cached[0]] + sorted(
-            commands, key=lambda corrected_command: corrected_command.priority)
+        if self._cached:
+            commands = self._remove_duplicates(self._commands)
+            self._cached = [self._cached[0]] + sorted(
+                commands, key=lambda corrected_command: corrected_command.priority)
         self._realised = True
         debug('SortedCommandsSequence was realised with: {}, after: {}'.format(
             self._cached, '\n'.join(format_stack())), self._settings)