[pitivi] Fix pylint unnecessary-pass

[Thibault Saunier <tsaunier src gnome org>]

commit 7577096fbc2a8fcfec333d3fd6f08864c19d01f9
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Sat Oct 26 00:37:44 2019 +0200

    Fix pylint unnecessary-pass

 pitivi/application.py    | 1 -
 pitivi/undo/undo.py      | 2 --
 pitivi/utils/pipeline.py | 2 --
 pitivi/utils/threads.py  | 1 -
 pitivi/utils/timeline.py | 1 -
 pitivi/utils/validate.py | 2 --
 6 files changed, 9 deletions(-)
---
diff --git a/pitivi/application.py b/pitivi/application.py
index c8982462..b26f5f0f 100644
--- a/pitivi/application.py
+++ b/pitivi/application.py
@@ -274,7 +274,6 @@ class Pitivi(Gtk.Application, Loggable):
             except GLib.Error as e:
                 if e.domain != "gtk-recent-manager-error-quark":
                     raise e
-                pass
             self.recent_manager.add_item(uri)
 
         self.action_log = UndoableActionLog()
diff --git a/pitivi/undo/undo.py b/pitivi/undo/undo.py
index dacda0f3..72642f7e 100644
--- a/pitivi/undo/undo.py
+++ b/pitivi/undo/undo.py
@@ -27,12 +27,10 @@ from pitivi.utils.loggable import Loggable
 
 class UndoError(Exception):
     """Base class for undo/redo exceptions."""
-    pass
 
 
 class UndoWrongStateError(UndoError):
     """Exception related to the current state of the undo/redo stack."""
-    pass
 
 
 class Action(GObject.Object, Loggable):
diff --git a/pitivi/utils/pipeline.py b/pitivi/utils/pipeline.py
index aaab2432..a66c81b1 100644
--- a/pitivi/utils/pipeline.py
+++ b/pitivi/utils/pipeline.py
@@ -150,7 +150,6 @@ class SimplePipeline(GObject.Object, Loggable):
             self.simple_seek(self.getPosition())
         except PipelineError as e:
             self.warning("Could not flush because: %s", e)
-            pass
 
     def setState(self, state):
         """Sets the low-level pipeline to the specified state.
@@ -397,7 +396,6 @@ class SimplePipeline(GObject.Object, Loggable):
                     except PipelineError as e:
                         self.warning("Could not get duration because: %s", e)
                         # no sinks??
-                        pass
 
                     if self._recovery_state == self.RecoveryState.STARTED_RECOVERING:
                         if self._attempted_recoveries == MAX_RECOVERIES:
diff --git a/pitivi/utils/threads.py b/pitivi/utils/threads.py
index 990689b4..95e07e27 100644
--- a/pitivi/utils/threads.py
+++ b/pitivi/utils/threads.py
@@ -62,7 +62,6 @@ class Thread(threading.Thread, GObject.Object, Loggable):
 
         Subclass have to implement this method !
         """
-        pass
 
 
 class ThreadMaster(Loggable):
diff --git a/pitivi/utils/timeline.py b/pitivi/utils/timeline.py
index a50edc1d..069a369a 100644
--- a/pitivi/utils/timeline.py
+++ b/pitivi/utils/timeline.py
@@ -36,7 +36,6 @@ SELECT_ADD = 2
 
 class TimelineError(Exception):
     """Base Exception for errors happening in `Timeline`s or `Clip`s."""
-    pass
 
 
 class Selected(GObject.Object):
diff --git a/pitivi/utils/validate.py b/pitivi/utils/validate.py
index f193c62c..c028f102 100644
--- a/pitivi/utils/validate.py
+++ b/pitivi/utils/validate.py
@@ -77,10 +77,8 @@ if GstValidate:
                 except (ImportError, ValueError):
                     print("Wnck not present on the system,"
                           " not checking the sink does not open a new window")
-                    pass
                 except AttributeError:
                     print("Wnck can not be used on the system")
-                    pass
 
         def _windowOpenedCb(self, screen, window):
             global monitor