Add file_exists macro to jinja context.

.gitignore

@@ -1,3 +1,4 @@
 site
 venv*
-.vscode
+.vscode
+__pycache__/

docs/themes/screenshots.md

@@ -2,7 +2,9 @@
 
 {% set themes = config.extra.themes %}
 {% for theme in themes %}
+{% if file_exists("/docs/site_assets/" ~ page.file.name ~ "/" ~ theme ~ ".png") %}
 <p align="center">  
 <a href="/site_assets/{{ page.file.name }}/{{ theme }}.png">{{ theme.capitalize() }} Theme<img src="/site_assets/{{ page.file.name }}/{{ theme }}.png"></img>
 </p>
+{% endif %}
 {% endfor %}

docs/themes/title.md

@@ -1,3 +1,4 @@
-<h1 align="center"> <img src="/site_assets/{{ page.file.name }}/logo.png" alt="logo" width="30" height="30"> {{ page.file.name.title().replace("-", " ") }} {% if deprecated == True %}(Deprecated){% else %}{% endif %}</h1>
+<h1 align="center"> {% if file_exists("/docs/site_assets/" ~ page.file.name ~ "/" ~ "logo.png") %}<img src="/site_assets/{{ page.file.name }}/logo.png" alt="logo" width="30" height="30"> {% endif %}
+{{ page.file.name.title().replace("-", " ") }} {% if deprecated == True %}(Deprecated){% else %}{% endif %}</h1>
 
 Custom [{{ page.file.name.title().replace("-", " ") }}]({{ github_link }}) CSS

main.py

@@ -0,0 +1,9 @@
+from pathlib import Path
+
+def define_env(env):
+    @env.macro
+    def file_exists(filepath: str) -> bool:
+        if not isinstance(filepath, str):
+            return False
+        filepath: Path = Path.cwd() / filepath.lstrip('/')
+        return filepath.exists()