Missing media not displayed on question side if last card had a missing media on answer side #21874

How to reproduce:

• have two basic notes, first with a image, missing, on back side. Second one with an image missing on front side
• review them in this order

Expected:

• two snackbar indicating media are missing, one on first's answer, second on second's question

Actual:

• The second snackbar is missing. It appears on answer side

This is because the error handler is only reset when displaying a question