In general I'd say it's fairly rare but it does happen.
My female corn that I've raised from a baby, 2001, never laid infertiles. In 2016 I adopted an adult male corn from a coworker's friend, once he was out of QT and in the snake room, opposite end of the room and never in contact with my female, she laid a clutch of infertiles that year and again in 2017. I fully expect her to do it again this summer. Apparently just knowing a male is nearby (scent or pheromones I would guess) triggered her to start doing this.
Our female leachie (only gecko we have) has laid infertiles every single year since she became mature. wheeeee
Edit to add - my cave dwelling rat snakes, which were a proven breeding pair, never laid infertiles (I never paired them up), over about 2 years that I had them.
Also not sure why you'd worry about her being eggbound. It may happen from time to time but that in itself usually isn't super common. The times my corn laid, she passed them without issue.
EDIT TO ALSO ADD (I keep thinking of stuff) that same female I mentioned above has been in a room with male and female corns before, I bred two other corns in 2010; but that didn't trigger her to lay.
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