Function "visit-tags-or-die" should not rely on "visit-tags-table" return value (patch attached)

[litvindev]

0001-Fixed-visit-tags-or-die-should-not-rely-on-visit-tag.txt

Due to this error, the functions like "mizar-show-ref" do not work.
And users have to patch it manually after each Mizar installation.

Emacs version: 26.1