K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2015-02-02T20:48:31.216643Z
K 7
svn:log
V 303
Let the standard deviation of the empty set be 0. This is consistent with
the behaviour for averages, and fixes a crash that can occur when attempting
to print a stddev aggregation containing no elements:

    dtrace:::BEGIN { @ = stddev(0); clear(@); printa("%@d", @); }

PR:		197260
MFC after:	2 week

END