--- a/hgext3rd/evolve/__init__.py	Sat Oct 14 19:06:06 2017 +0200
+++ b/hgext3rd/evolve/__init__.py	Sat Oct 14 19:08:22 2017 +0200
@@ -492,11 +492,11 @@
 
 @eh.uisetup
 def _installalias(ui):
-    if ui.config('alias', 'odiff', None) is None:
+    if ui.config('alias', 'odiff') is None:
         ui.setconfig('alias', 'odiff',
                      "diff --hidden --rev 'limit(precursors(.),1)' --rev .",
                      'evolve')
-    if ui.config('alias', 'grab', None) is None:
+    if ui.config('alias', 'grab') is None:
         if os.name == 'nt':
             hgexe = ('"%s"' % util.hgexecutable())
             ui.setconfig('alias', 'grab', "! " + hgexe