# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 1528202433 -32400
# Node ID 354fad8697fddfbc079b943229b8f9c17117c6a6
# Parent  4b0f39e7406e1063bc3cfd5a9616f35651255aeb
templater: fix string representation of wrapped None

flatten() and stringify() skip None, which means wrappedvalue(None).show()
must return '' instead of 'None'. This isn't a problem right now, but we'll
encounter it once we start using wrapped types extensively.

diff -r 4b0f39e7406e -r 354fad8697fd mercurial/templateutil.py
--- a/mercurial/templateutil.py	Fri Jun 08 20:57:54 2018 +0900
+++ b/mercurial/templateutil.py	Tue Jun 05 21:40:33 2018 +0900
@@ -155,6 +155,8 @@
         raise error.ParseError(_('%r is not iterable') % self._value)
 
     def show(self, context, mapping):
+        if self._value is None:
+            return b''
         return pycompat.bytestr(self._value)
 
     def tovalue(self, context, mapping):