make Artist optional

acros/migrations/0043_auto_20200718_2018.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.0.8 on 2020-07-18 20:18
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('acros', '0042_auto_20200718_2017'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='wikipediaimage',
+            name='artist',
+            field=models.TextField(blank=True, null=True),
+        ),
+    ]

acros/models/WikipediaImage.py

@@ -16,7 +16,7 @@ class WikipediaImage(models.Model):
     imageurl = models.URLField()
     caption = models.CharField(max_length=1000, null=True, blank=True)
     credit = models.TextField(null=True, blank=True)
-    artist = models.TextField()
+    artist = models.TextField(null=True, blank=True)
     license_short_name = models.TextField()
     attribution = models.TextField(null=True, blank=True)
     license_url = models.URLField(null=True, blank=True)

acros/utils/apis.py

@@ -106,8 +106,9 @@ class WikipediaImageAPIObject:
             return clean_html(self.extmetadata["Credit"]["value"])
 
     @property
-    def artist(self) -> str:
-        return clean_html(self.extmetadata["Artist"]["value"])
+    def artist(self) -> Optional[str]:
+        if "Artist" in self.extmetadata:
+            return clean_html(self.extmetadata["Artist"]["value"])
 
     @property
     def license_short_name(self) -> str: