incipit previews fail to display musical symbols

[peterstadler]

Most probably, the <g> elements are not processed properly for previews.

Reported by @obertsalome for A046278:

[peterstadler]

Incipit is a string only:

WeGA-WebApp/modules/app.xqm

Line 1849 in f767328

app:print-incipit($node, $model, $lang, 'true') ! str:normalize-space(.) => string-join('; ')

Hence no font information …