Don't send uninitialized stack to the controller and say it's a date.

Fixes bug 11519, apparently bugfix on 0.2.3.11-alpha.
Merge remote-tracking branch 'public/bug11519_023' into maint-0.2.3
Merge remote-tracking branch 'origin/maint-0.2.3' into maint-0.2.4

Conflicts:
	src/or/circuituse.c