Bug#892548: dhelp: /usr/sbin/dhelp_parse broken with ruby 2.5

[Коля Гурьев]

tags 892548 - unreproducible
reassign 892548 libruby2.5
forcemerge 892099 892548
stop

It appears the bug with very similar issue was fixed in the libruby2.5
package so I merge these bugs. If your error still exists, let us know.