arxivutils: fix issue with unexpectedly missing cross-lists
arxivutils: fix issue with unexpectedly missing cross-lists

waqasbhatti/astroph-coffee,waqasbhatti/astroph-coffee,waqasbhatti/astroph-coffee,waqasbhatti/astroph-coffee,waqasbhatti/astroph-coffee,waqasbhatti/astroph-coffee