fix: #2439 - endMessage in CommonPaginator

[ttntm]

This is a PR for #2439 that adds a check for items.length in CommonPaginator.vue before setting the endMessage displayed in the UI.

1+ entries show common.end_of_list now:

<= 0 entries show the endMessage defined by the parent component, i.e. common.no_bookmarks in TimelineBookmarks.vue:

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[patak-dev]

Thanks!