Numbered appendix causes extra dot in captions when replacing template partials

Bug description

#247 reported an extra dot was added to section, figure and table captions when using a numbered appendix. This was fixed in fd73f4ee8f5e85e79b92ee17741f2c43421ff2a0. However, I noticed the dot is still added when replacing any of the template partials, even when template-partials is just an empty list.

Steps to reproduce

---
format:
  pdf:
    documentclass: scrreprt
    template-partials: []
number-sections: true
---

# Introduction

|a|b|
|-|-|
|1|2|

: Some table.

\appendix
# Some appendix

Expected behavior

Actual behavior

Your environment

• IDE: RStudio 2024.09.0+375
• OS: Microsoft Windows 11 Home

Quarto check output

$ quarto check
Quarto 1.6.39
[>] Checking environment information...
      Quarto cache location: C:\Users\niels\AppData\Local\quarto
[>] Checking versions of quarto binary dependencies...
      Pandoc version 3.4.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.46.3: OK
      Typst version 0.11.0: OK
[>] Checking versions of quarto dependencies......OK
[>] Checking Quarto installation......OK
      Version: 1.6.39
      Path: C:\Users\niels\AppData\Local\Programs\Quarto\bin
      CodePage: 1252

[>] Checking tools....................OK
      TinyTeX: v2024.10
      Chromium: (not installed)

[>] Checking LaTeX....................OK
      Using: TinyTex
      Path: C:\Users\niels\AppData\Roaming\TinyTeX\bin\windows\
      Version: 2024

[>] Checking basic markdown render....OK

[>] Checking Python 3 installation....OK
      Version: 3.10.6
      Path: C:/Users/niels/AppData/Local/Programs/Python/Python310/python.exe
      Jupyter: (None)

      Jupyter is not available in this Python installation.
      Install with py -m pip install jupyter

[>] Checking R installation...........OK
      Version: 4.4.1
      Path: C:/PROGRA~1/R/R-44~1.1
      LibPaths:
        - C:/Users/niels/Documents/quarto-bug/renv/library/windows/R-4.4/x86_64-w64-mingw32
        - C:/Users/niels/AppData/Local/R/cache/R/renv/sandbox/windows/R-4.4/x86_64-w64-mingw32/e0da0d43
      knitr: 1.49
      rmarkdown: 2.29

[>] Checking Knitr engine render......OK

Start with the supplied .qmd reproduction and inspect how PDF template-partials are handled when numbering sections and entering an appendix. Compare the generated captions with the expected behavior, then add a regression test if the repository has coverage for this rendering path; done means no extra dot appears with an empty template-partials list.