[gnome-tweaks] Don't crash if a GSettings schema is missing

[Jeremy Bicha <jbicha src gnome org>]

commit 1b7149f8f5f38726822439d6b9c960801ca9ecb2
Author: Simon McVittie <smcv debian org>
Date:   Tue Mar 6 12:09:08 2018 +0000

    Don't crash if a GSettings schema is missing
    
    GSettingsMissingError doesn't have a message attribute, at least under
    Python 3.6. This caused a crash in distributions like Debian where
    commit 53a8edb7 "desktop: Don't install panel" was reverted to support
    Nautilus 3.26, when used in conjunction with a prerelease build of
    Nautilus 3.27.
    
    Use the logging module's support for '%' interpolation while I'm
    touching those lines anyway, as recommended by pylint warning W1201.

 gtweak/widgets.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtweak/widgets.py b/gtweak/widgets.py
index c282bfe..3d48a51 100644
--- a/gtweak/widgets.py
+++ b/gtweak/widgets.py
@@ -134,7 +134,7 @@ def adjust_schema_for_overrides(originalSchema, key, options):
             options['schema_filename'] = overridesFile
             return overridesSchema
     except GSettingsMissingError as e:
-        logging.info("GSetting missing %s" % (e.message))
+        logging.info("GSetting missing %s", e)
 
     return originalSchema
 
@@ -157,7 +157,7 @@ class _GSettingsTweak(Tweak):
             self.settings = GSettingsFakeSetting()
             Tweak.__init__(self,"","")
             self.loaded = False
-            logging.info("GSetting missing %s" % (e.message))
+            logging.info("GSetting missing %s", e)
         except KeyError:
             self.settings = GSettingsFakeSetting()
             Tweak.__init__(self,"","")