fix: Allow empty icon (None) in icon tags (#159)

.github/workflows/docs.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: '3.11'
           cache: 'pip'
       - name: Cache dependencies
         uses: actions/[email protected]
@@ -41,7 +41,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: '3.11'
           cache: 'pip'
       - name: Cache dependencies
         uses: actions/[email protected]

.readthedocs.yaml

@@ -1,5 +1,12 @@
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
 version: 2
 
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
 sphinx:
   configuration: docs/source/conf.py
   fail_on_warning: false
@@ -9,7 +16,5 @@ formats:
   - pdf
 
 python:
-  version: 3.8
-
   install:
-      - requirements: docs/requirements.txt
+    - requirements: docs/requirements.txt

djangocms_frontend/contrib/icon/templatetags/icon_tags.py

@@ -8,7 +8,7 @@
 
 @register.inclusion_tag("djangocms_frontend/icon/add_css.html", takes_context=True)
 def add_css_for_icon(context, icon):
-    if icon.get("library", "") in ICON_LIBRARIES:
+    if icon and icon.get("library", "") in ICON_LIBRARIES:
         css_link = ICON_LIBRARIES[icon.get("library")][1]
         if css_link:
             if "/" not in css_link:  # static link?