From the PR:
In the IR of our university, not all items have file (full text like pdf or we call 全文) , just some of them.
We want a function to show if there is a file in the item at the list view so I write (or maybe hack) some code into the core of dspace.
My code may not be great, but at least this will work.
If someone want this function too, they can add 'bitstream' to webui.itemlist.columns like line 1845 in dspace.cfg and the full version (with the file name and its link) can be enabled by webui.browse.bitstream.showfull = true on line 994 in dspace.cfg