Use MatrixClientPeg::safeGet for strict typing (#10989)

src/settings/controllers/NotificationControllers.ts

@@ -28,7 +28,7 @@ import { SettingLevel } from "../SettingLevel";
 // default action on this rule is dont_notify, but it could be something else
 export function isPushNotifyDisabled(): boolean {
     // Return the value of the master push rule as a default
-    const processor = new PushProcessor(MatrixClientPeg.get());
+    const processor = new PushProcessor(MatrixClientPeg.safeGet());
     const masterRule = processor.getPushRuleById(".m.rule.master");
 
     if (!masterRule) {