If node stEvt:softwareAgent not found, skip as not a lightroom xmp.
Proactive fix to avoid a crash trying to dereference a null pointer.
Merge branch 'fix-crash-lr-import'

* fix-crash-lr-import:
  Proactive fix to avoid a crash trying to dereference a null pointer.
  If node stEvt:softwareAgent not found, skip as not a lightroom xmp.