AM code: empty manifest bugfix

Wim Van de Meersscherequested to merge
wvdemeer/emulab-devel:empty-manifest-fix into master

This fixes a rare bug causing emulab to return an invalid empty manifest.

GeniAM.pm.in calls GeniStd:GenerateEmptyManifest() in 2 special cases, but the XML returned by GenerateEmptyManifest() did not have a closing </rspec> tag.

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