fix problem in download.py when title has not been set

kontor-api/src/db/models/media.py

@@ -71,7 +71,7 @@ class MediaFile(Base, BaseMixin, BaseVideoMixin):
 class MediaActor(Base, BaseMixin):
     __tablename__ = 'media_actor'
     name = Column(String)
-    url = Column(String, unique=True)
+    url = Column(String, unique=True, nullable=True)
     media_actor_files = relationship("MediaActorFile")
 
 
@@ -82,6 +82,11 @@ class MediaActorFile(Base, BaseMixin):
     media_file_id = Column(String, ForeignKey("media_file.id"), nullable=True)
     media_file = relationship("MediaFile", back_populates="media_actor_files")
 
+    def __repr__(self):
+        return f'MediaActorFile({self.id} {self.media_actor_id} {self.media_file_id})'
+
+    def __str__(self) -> str:
+        return f'{self.id} {self.media_actor_id} {self.media_file_id}'
 
 class MediaArticle(Base, BaseMixin):
     __tablename__ = 'media_article'