
Fix a longstanding bug when dpkg isn't present.  The idea is
we silently continue in that case, but we run sh -e, which
causes the script to abort on error, even if the error is
inside backticks (``).  So we make sure the dpkg command never
gives an error, even when it's not installed.

Reported in
http://code.google.com/p/google-ctemplate/issues/detail?id=79

R=ajenjo,markus
DELTA=3  (0 added, 0 deleted, 3 changed)


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