fix: Marked Radarr studios as nullable to prevent crashes

src/handlers/table_handler_tests.rs

@@ -1165,7 +1165,7 @@ mod tests {
           name: "English".to_owned(),
         },
         size_on_disk: 1024,
-        studio: "Studio 1".to_owned(),
+        studio: Some("Studio 1".to_owned()),
         year: 2024,
         monitored: false,
         runtime: 12.into(),
@@ -1182,7 +1182,7 @@ mod tests {
           name: "Chinese".to_owned(),
         },
         size_on_disk: 2048,
-        studio: "Studio 2".to_owned(),
+        studio: Some("Studio 2".to_owned()),
         year: 1998,
         monitored: false,
         runtime: 60.into(),
@@ -1199,7 +1199,7 @@ mod tests {
           name: "Japanese".to_owned(),
         },
         size_on_disk: 512,
-        studio: "studio 3".to_owned(),
+        studio: Some("studio 3".to_owned()),
         year: 1954,
         monitored: true,
         runtime: 120.into(),