dsextras.py: PEP8: Comparisons to singletons like None should always be done with 'is' or 'is not', never the equality operators.
dsextras.py: PEP8: Comparisons to singletons like None should always be done with 'is' or 'is not', never the equality operators.

Signed-off-by: Dieter Verfaillie <ed2c9e2fab82acaa7daaf30cf5cc5ab110dfe77c@optionexplicit.be>

nzjrs/pygobject,GNOME/pygobject,davidmalcolm/pygobject,thiblahute/pygobject,alexef/pygobject,pexip/pygobject,MathieuDuponchelle/pygobject,nzjrs/pygobject,davibe/pygobject,Distrotech/pygobject,thiblahute/pygobject,pexip/pygobject,alexef/pygobject,GNOME/pygobject,Distrotech/pygobject,alexef/pygobject,MathieuDuponchelle/pygobject,davidmalcolm/pygobject,sfeltman/pygobject,jdahlin/pygobject,pexip/pygobject,thiblahute/pygobject,choeger/pygobject-cmake,GNOME/pygobject,davibe/pygobject,choeger/pygobject-cmake,nzjrs/pygobject,Distrotech/pygobject,davibe/pygobject,davidmalcolm/pygobject,jdahlin/pygobject,jdahlin/pygobject,sfeltman/pygobject,MathieuDuponchelle/pygobject,davibe/pygobject,sfeltman/pygobject,Distrotech/pygobject,choeger/pygobject-cmake