Do not render null if title is nil

Newsflash on Gnome and some other apps really don't like if a title is
null and crash. This prevents this.

Author: bitboxer

app/models/feed.rb

@@ -30,7 +30,7 @@ def as_fever_json
     {
       id:,
       favicon_id: 0,
-      title: name,
+      title: name || "",
       url:,
       site_url: url,
       is_spark: 0,

spec/models/feed_spec.rb

@@ -81,5 +81,25 @@
         last_updated_on_time: last_fetched.to_i
       )
     end
+
+    it "should replace a null title with an empty string" do
+      last_fetched = 1.day.ago
+      feed = Feed.new(
+        id: 52,
+        name: nil,
+        url: "wat url",
+        last_fetched:
+      )
+
+      expect(feed.as_fever_json).to eq(
+        id: 52,
+        favicon_id: 0,
+        title: "",
+        url: "wat url",
+        site_url: "wat url",
+        is_spark: 0,
+        last_updated_on_time: last_fetched.to_i
+      )
+    end
   end
 end