This fixes a regression (bug #16) introduced in
95c1f39f60, where a NULL check was
removed. This caused NULL error variable values to be sent to
add_error_variable() in which strlen() segfaulted.
With this fix, custom stats pages should be displayed properly.
X-Banu-Bugzilla-Ids: 16
This change primarily avoids a gcc warning where timebuf
is never non-NULL. There is no need to check the value to be
inserted as it's checked inside hashmap_insert().
This changeset also lets error return values from hashmap_insert()
propogate instead of clamping them to -1 (not that these are
currently used anyway).
