missing data in Outline_root_pervolume

[berger-n]

from https://github.com/buda-base/public-digital-library/issues/759:

1. open https://library.bdrc.io/show/bdr:MW22022 (resp. https://library.bdrc.io/show/bdr:MW0TT0000)
2. click first section, gzhung yig (resp. fourth section, 法華部類) -- both have only one virtual volume than loads automatically
3. compare data returned by both queries:
   • https://ldspdi.bdrc.io/query/graph/Outline_root_pervolume?R_RES=bdr%3AMW0TS004&I_VNUM=9 has contentLocation etc. and all subnodes of MW0TS004 that are in volume 9
   • https://ldspdi.bdrc.io/query/graph/Outline_root_pervolume?R_RES=bdr%3AMW22022_F89510&I_VNUM=1 has not