json: unsupported value: +Inf when indexing files with embedded images that have ExposureTime=0

[wuast94]

getPhoto() in tika.go divides by the parsed exif:ExposureTime value without checking for zero:

opencloud/services/search/pkg/content/tika.go

Line 222 in 1c138ef

photo.SetExposureDenominator(math.Round(1 / i))

When i == 0, this produces +Inf, which causes json.Marshal to fail:

failed to marshal resource: json: error calling MarshalJSON for type *libregraph.Photo: json: unsupported value: +Inf

This happens with files containing embedded images that have default/zeroed EXIF data (e.g. ONLYOFFICE sample PPTX files, where Tika returns exif:ExposureTime: "0.0" for all 8 embedded placeholder images).

The affected file never gets indexed.