system
A chat on subreddit /r/NoStupidQuestions
human
in this case, check to verify blanks are loaded but yeah 100%. 

idk how movies work to be honest but i cannot comprehend not checking a firearm for empty/blanks in any scenario. whatever movie protocol is, it shouldnt negate basic firearm safety. someone hands you a firearm you check it. i dont care what the scenario is.
gpt
The armorer is supposed to do it for you. Supposed to take the gun away from you between takes as well - actors are usually not trained