[dev] nag summary tweak

[Ben Chavet]

Just a little tweak on the nag summary.  When 'show alarms' is selected, but
there are no alarms, there was a space where there was a table created.  That
table is not longer created when there are no alarms.  Looks a little cleaner
this way.

nag/lib/Block/summary.php

--Ben
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