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technical control
Has your car got working indicators visible from front and back? In other words is the non-working indicator an extra bonus? If so, you are unlikely to fail on that alone though it will be mentioned if the car fails for other reasons.
How is the indicator damaged? If just the bulb, then replace it - the user's manual should tell you how.
Otherwise it is a case of economics. Get it repaired at a garage and it will pass. Hope for the best and, if it fails, you still have to get it repaired at a garage and pay €12 for a retest. I know which I would do!!
BTW a retest only checks the items for which the car has been failed so you don't have to go through the full test rigmarole again.
Good luck.
I strongly suggest you first get the indicator fixed & then go to the technical control.