bug#63759: 29.0.91; dockerfile-ts-mode--imenu returns invalid index

[Jimmy Yuen Ho Wong <wyuenho@gmail.com>]

Reproduction:

0. Open a Emacs GUI, i.e. NS port
1. C-x C-f /some/nonexistent/Dockerfile
2. M-x toggle-debug-on-error
2. M-x imenu-add-menubar-index
3. Click on the Index > Stage menu item
4. Observe the following error pops up

Expectation:

If the dockerfile-ts-mode buffer is empty, there should not be an extra
item preset in the imenu index that when clicked on will jump to a
non-existent location and result in an error.

```
Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p nil)
  imenu-default-goto-function("Stage" nil)
  imenu(("Stage" nil imenu-default-goto-function))
  imenu(("Stage"))
  imenu--menubar-select(("Stage"))
  #f(compiled-function () (interactive nil) #<bytecode 0xcfe8182542f4cbd>)()
  funcall-interactively(#f(compiled-function () (interactive nil) #<bytecode 0xcfe8182542f4cbd>))
  #<subr call-interactively>(#f(compiled-function () (interactive nil) #<bytecode 0xcfe8182542f4cbd>) nil nil)
  call-interactively@ido-cr+-record-current-command(#<subr call-interactively> #f(compiled-function () (interactive nil) #<bytecode 0xcfe8182542f4cbd>) nil nil)
  apply(call-interactively@ido-cr+-record-current-command #<subr call-interactively> (#f(compiled-function () (interactive nil) #<bytecode 0xcfe8182542f4cbd>) nil nil))
  call-interactively(#f(compiled-function () (interactive nil) #<bytecode 0xcfe8182542f4cbd>) nil nil)
  command-execute(#f(compiled-function () (interactive nil) #<bytecode 0xcfe8182542f4cbd>))
```


In GNU Emacs 29.0.91 (build 1, aarch64-apple-darwin22.4.0, NS
 appkit-2299.50 Version 13.3.1 (a) (Build 22E772610a)) of 2023-05-26
 built on MobileCat.localdomain
Windowing system distributor 'Apple', version 10.3.2299
System Description:  macOS 13.3.1

Configured using:
 'configure --prefix=/opt/local --disable-silent-rules --without-dbus
 --without-gconf --without-libotf --without-m17n-flt --with-libgmp
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