Fix a code smell to test SonarQube

.github/workflows/sonar.yml

@@ -0,0 +1,25 @@
+on:
+    # Trigger analysis when pushing to your main branches, and when creating a pull request.
+    push:
+      branches:
+        - main
+        - master
+        - develop
+        - 'releases/**'
+    pull_request:
+        types: [opened, synchronize, reopened]
+
+name: Main Workflow
+jobs:
+    sonarqube:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+              with:
+                # Disabling shallow clones is recommended for improving the relevancy of reporting
+                fetch-depth: 0
+            - name: SonarQube Scan
+              uses: sonarsource/[email protected]
+              env:
+                SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+                SONAR_HOST_URL: ${{ vars.SONAR_HOST_URL }}

iiif_binder/__init__.py

@@ -1,5 +1,6 @@
 import json
 from os.path import exists
+from typing import Optional
 
 from pydantic import BaseModel, Path
 
@@ -13,7 +14,7 @@ class Config(BaseModel):
 
 
 class Metadata(BaseModel):
-    title: str = None
+    title: Optional[str] = None
     description: str = None
     navdate: str = None
     viewing_hint: str = "individuals"
@@ -22,7 +23,7 @@ class Metadata(BaseModel):
 
 
 class Image(BaseModel):
-    url_id: str
+    url_id: str = None
     url_path: str
     width: int
     height: int

sonar-project.properties

@@ -0,0 +1,6 @@
+sonar.projectKey=bitzl_iiif-binder
+sonar.organization=bitzl
+
+# relative paths to source directories. More details and properties are described
+# at https://docs.sonarqube.org/latest/project-administration/narrowing-the-focus/ 
+sonar.sources=.