python3: Fix PEP8 and avoid crash when listing

src/python-lxc/examples/api_test.py

@@ -19,7 +19,8 @@
 #
 # You should have received a copy of the GNU Lesser General Public
 # License along with this library; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+# USA
 #
 
 import warnings

src/python-lxc/examples/pyconsole-vte.py

@@ -20,7 +20,8 @@
 #
 # You should have received a copy of the GNU Lesser General Public
 # License along with this library; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+# USA
 #
 
 import warnings

src/python-lxc/examples/pyconsole.py

@@ -20,7 +20,8 @@
 #
 # You should have received a copy of the GNU Lesser General Public
 # License along with this library; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+# USA
 #
 
 import warnings

src/python-lxc/lxc/__init__.py

@@ -18,7 +18,8 @@
 #
 # You should have received a copy of the GNU Lesser General Public
 # License along with this library; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+# USA
 #
 
 import _lxc
@@ -346,7 +347,6 @@ class Container(_lxc.Container):
 
         return _lxc.Container.get_interfaces(self)
 
-
     def get_ips(self, interface=None, family=None, scope=None, timeout=0):
         """
             Get a tuple of IPs for the container.
@@ -430,6 +430,8 @@ def list_containers(active=True, defined=True,
     """
 
     if config_path:
+        if not os.path.exists(config_path):
+            return tuple()
         entries = _lxc.list_containers(active=active, defined=defined,
                                        config_path=config_path)
     else:
@@ -456,6 +458,7 @@ def attach_run_command(cmd):
     else:
         return _lxc.attach_run_command((cmd, [cmd]))
 
+
 def attach_run_shell():
     """
         Run a shell when attaching
@@ -466,6 +469,7 @@ def attach_run_shell():
     """
     return _lxc.attach_run_shell(None)
 
+
 def arch_to_personality(arch):
     """
         Determine the process personality corresponding to the architecture