Comment 3 for bug 1655530

From https://bugs.launchpad.net/catfish-search/+bug/1655530

~ $ catfish

(catfish:3117): Gtk-WARNING **: /build/gtk+3.0-6ZPWga/gtk+3.0-3.18.9/./gtk/gtkwidget.c:8456: widget not within a GtkWindow
Traceback (most recent call last):
  File "/usr/bin/catfish", line 42, in <module>
    catfish.main()
  File "/usr/lib/python3/dist-packages/catfish/__init__.py", line 74, in main
    window = CatfishWindow.CatfishWindow()
  File "/usr/lib/python3/dist-packages/catfish_lib/Window.py", line 168, in __new__
    new_object.finish_initializing(builder)
  File "/usr/lib/python3/dist-packages/catfish/CatfishWindow.py", line 124, in finish_initializing
    super(CatfishWindow, self).finish_initializing(builder)
  File "/usr/lib/python3/dist-packages/catfish_lib/Window.py", line 202, in finish_initializing
    settings = CatfishSettings.CatfishSettings()
  File "/usr/lib/python3/dist-packages/catfish_lib/CatfishSettings.py", line 43, in __init__
    self.read()
  File "/usr/lib/python3/dist-packages/catfish_lib/CatfishSettings.py", line 63, in read
    for line in open(self.settings_file):
  File "/usr/lib/python3.5/codecs.py", line 321, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x95 in position 1: invalid start byte