bug#58889: 29.0.50; C-x p f on svn project fails

[Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Trying to navigate with C-x p f in an SVN repository fails, because the
SVN repository has an ignore property with empty lines.  This is the
detailed error.

Debugger entered--Lisp error: (args-out-of-range "" 0)
  #f(compiled-function (entry) #<bytecode -0x1726de7462823143>)("")
  mapcar(#f(compiled-function (entry) #<bytecode -0x1726de7462823143>) ("" ""))
  #f(compiled-function (project dir) #<bytecode 0x187989c589069892>)((vc SVN "~/project/") "~/project/")
  apply(#f(compiled-function (project dir) #<bytecode 0x187989c589069892>) (vc SVN "~/project/") "~/project/")
  project-ignores((vc SVN "~/project/") "~/project/")
  project--dir-ignores((vc SVN "~/project/") "~/project/")
  #f(compiled-function (dir) #<bytecode 0x68383878a42445c>)("~/project/")
  mapcan(#f(compiled-function (dir) #<bytecode 0x68383878a42445c>) ("~/project/"))
  #f(compiled-function (project &optional dirs) #<bytecode -0x1baeb702532f0340>)((vc SVN "~/project/") ("~/project/"))
  apply(#f(compiled-function (project &optional dirs) #<bytecode -0x1baeb702532f0340>) (vc SVN "~/project/") ("~/project/"))
  project-files((vc SVN "~/project/") ("~/project/"))
  project-find-file-in(#("Flipped90:" 0 10 (fontified t)) ("~/project/") (vc SVN "~/project/") nil)
  project-find-file(nil)
  funcall-interactively(project-find-file nil)
  command-execute(project-find-file)

Would someone please take a look at this?

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu) of 2022-10-29 built
 on trinity
Repository revision: f826f56a413a07eee2782655809e1f5e102c6153
Repository branch: HEAD
Windowing system distributor 'The X.Org Foundation', version 11.0.100000000000
System Description: Fedora Linux 36 (Workstation Edition)

Configured using:
 'configure --with-native-compilation --with-x-toolkit=no
 --without-cairo'

Configured features:
ACL DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON LCMS2
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
OLDXMENU PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF WEBP X11
XDBE XFT XIM XINPUT2 XPM ZLIB

Important settings:
  value of $LANG: en_GB.utf8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: C/*l

Minor modes in effect:
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-networks-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  sly-symbol-completion-mode: t
  global-edit-server-edit-mode: t
  global-git-commit-mode: t
  display-time-mode: t
  electric-pair-mode: t
  desktop-save-mode: t
  telega-active-locations-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  lost-selection-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  abbrev-mode: t