don't warn if optional stylesheet is missing

Author: deltragon

safeeyes/safeeyes.py

@@ -170,7 +170,9 @@ def _initialize_styles(self):
             utility.SYSTEM_STYLE_SHEET_PATH, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
         )
         utility.load_css_file(
-            utility.CUSTOM_STYLE_SHEET_PATH, Gtk.STYLE_PROVIDER_PRIORITY_USER
+            utility.CUSTOM_STYLE_SHEET_PATH,
+            Gtk.STYLE_PROVIDER_PRIORITY_USER,
+            required=False,
         )
 
     def _retry_errored_plugins(self):

safeeyes/utility.py

@@ -388,7 +388,12 @@ def sha256sum(filename):
     return h.hexdigest()
 
 
-def load_css_file(style_sheet_path, priority):
+def load_css_file(style_sheet_path, priority, required=True):
+    if not os.path.isfile(style_sheet_path):
+        if required:
+            logging.warning("Failed loading required stylesheet")
+        return
+
     css_provider = Gtk.CssProvider()
     css_provider.load_from_path(style_sheet_path)