fix: 🐛 Fix isAsciicast check (#301)

✅ Closes: ICU-9511

addons/api/addon/models/channel-recording.js

@@ -11,7 +11,7 @@ export default class ChannelRecordingModel extends GeneratedChannelRecordingMode
    * @type {boolean}
    */
   get isAsciicast() {
-    return this.mime_types.includes(MIME_TYPE_ASCIICAST);
+    return this.mime_types?.includes(MIME_TYPE_ASCIICAST) ?? false;
   }
 
   /**

addons/api/tests/unit/models/channel-recording-test.js

@@ -23,4 +23,17 @@ module('Unit | Model | channel-recording', function (hooks) {
     assert.true(modelA.isAsciicast);
     assert.false(modelB.isAsciicast);
   });
+
+  test('it has isAsciicast property and returns the expected values when mime_types are not present', async function (assert) {
+    assert.expect(2);
+    const store = this.owner.lookup('service:store');
+    const modelA = store.createRecord('channel-recording', {
+      mime_types: undefined,
+    });
+    const modelB = store.createRecord('channel-recording', {
+      mime_types: [],
+    });
+    assert.false(modelA.isAsciicast);
+    assert.false(modelB.isAsciicast);
+  });
 });