bug#62719: 30.0.50; Eglot: `consult-imenu--normalize: Unknown imenu item: nil` caused by b1f8d98a119ab8845d25d80c480cde6e385d8749

[Casey Banner <kcbanner@gmail.com>]

After b1f8d98a119ab8845d25d80c480cde6e385d8749 I'm seeing the
following error when invoking consult-imenu:

`consult-imenu--normalize: Unknown imenu item: nil`.

If I build 5e5f5b28e92a3bb927bb03c783c426c6c3baeadc (the commit
before), this error goes away. The LSP I'm using is zls. I'm not sure
if this is a bug with consult (not compatible with new changes) or a
problem with the eglot imenu changes.

In GNU Emacs 30.0.50 (build 4, x86_64-w64-mingw32) of 2023-04-07 built
 on DESKTOP-EK25TL1
Repository revision: 5e5f5b28e92a3bb927bb03c783c426c6c3baeadc
Repository branch: HEAD
Windowing system distributor 'Microsoft Corp.', version 10.0.19044
System Description: Microsoft Windows 10 Pro (v10.0.2009.19044.2728)

Configured using:
 'configure --prefix=/e/dev/emacs-src --without-dbus --without-pop
 --with-native-compilation --with-cairo --with-harfbuzz --with-xml2
 --without-compress-install --with-json 'CFLAGS=-O2 -mtune=native
 -march=native -fomit-frame-pointer -ftree-vectorize'
 PKG_CONFIG_PATH=/mingw64/lib/pkgconfig:/mingw64/share/pkgconfig'

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XPM ZLIB

Important settings:
  value of $LANG: ENC
  locale-coding-system: cp1252

Major mode: Zig

Minor modes in effect:
  eglot-inlay-hints-mode: t
  eglot--managed-mode: t
  flymake-mode: t
  display-line-numbers-mode: t
  which-key-mode: t
  solaire-global-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  corfu-history-mode: t
  global-corfu-mode: t
  corfu-mode: t
  vertico-multiform-mode: t
  vertico-mode: t
  minibuffer-depth-indicate-mode: t
  minions-mode: t
  doom-modeline-mode: t
  all-the-icons-completion-mode: t
  popper-echo-mode: t
  popper-mode: t
  override-global-mode: t
  global-smartscan-mode: t
  smartscan-mode: t
  global-hl-line-mode: t
  gcmh-mode: t
  recentf-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  straight-symlink-emulation-mode: t
  straight-live-modifications-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t