MOBILE-3523 mod: Fix cannot get siteId of undefined

Author: dpalou

src/addon/mod/data/providers/data.ts

@@ -947,7 +947,7 @@ export class AddonModDataProvider {
      * @param options Other options.
      * @return Promise resolved when the action is done.
      */
-    searchEntries(dataId: number, options?: AddonModDataSearchEntriesOptions): Promise<AddonModDataEntries> {
+    searchEntries(dataId: number, options: AddonModDataSearchEntriesOptions = {}): Promise<AddonModDataEntries> {
         options.groupId = options.groupId || 0;
         options.sort = options.sort || 0;
         options.order || options.order || 'DESC';

src/addon/mod/folder/providers/folder.ts

@@ -57,7 +57,7 @@ export class AddonModFolderProvider {
      * @param options Other options.
      * @return Promise resolved when the book is retrieved.
      */
-    protected getFolderByKey(courseId: number, key: string, value: any, options?: CoreSitesCommonWSOptions)
+    protected getFolderByKey(courseId: number, key: string, value: any, options: CoreSitesCommonWSOptions = {})
             : Promise<AddonModFolderFolder> {
         return this.sitesProvider.getSite(options.siteId).then((site) => {
             const params = {