Well after ship can not detect any more anomalies it gives a message - that's cool addition.
However if later you double click on ship and try to make it go again while still no anomalies around the checkboxs just disapear and no message given.
After that if you close the ship commands dialog you get "can't see any anomalies" messages as many time as you clicked on "autosurvay" button earlie - this is bug.
Btw: a bit unrelated, but why not to leave ship in "ready to get anomalies" mode ? - Meaning as soon as anomaly apeared the ship will start moving toward it .This will even the chances with AI a bit, after all computer always sends it's ships if new anomaly apeared while humen may miss it.