Daniel Golle ec78f03de5 image: fix build without ucert
Make sure the Shell-expression returns true also in case of
key-build.ucert being absent.

Fixes commit 848b455d2e ("image: use ucert to append signature")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2018-08-08 00:48:53 +02:00
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