[Backport staging] Fix regressions around media uploads failing and causing soft crashes (#9550)

(cherry picked from commit 77764d80bc)

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

test/Notifier-test.ts

@@ -232,6 +232,15 @@ describe("Notifier", () => {
         });
     });
 
+    describe("getSoundForRoom", () => {
+        it("should not explode if given invalid url", () => {
+            jest.spyOn(SettingsStore, "getValue").mockImplementation((name: string) => {
+                return { url: { content_uri: "foobar" } };
+            });
+            expect(Notifier.getSoundForRoom("!roomId:server")).toBeNull();
+        });
+    });
+
     describe("_playAudioNotification", () => {
         it.each([
             { event: { is_silenced: true }, count: 0 },