Remove null check in ElectronStorageService.Save (#464)

electron/src/services/electronStorage.service.ts

@@ -46,9 +46,6 @@ export class ElectronStorageService implements StorageService {
     }
 
     save(key: string, obj: any): Promise<any> {
-        if (obj == null) {
-            return Promise.resolve();
-        }
         if (obj instanceof Set) {
             obj = Array.from(obj);
         }