Fix some potential null references #1213
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As a side result of the discussion on the annotated front-end, @kamil4 pointed out that a photo might not have a thumbnail, if the photo is a video and FFmpeg is not installed (probably there are some other cases, too, but this is the most prominent one).
Hence, I checked with the back-end if there is any code which wrongly assumes that thumbnails always exists. Luckily, the situation has not been as bad as I initially feared, but I found to issues nonetheless.