MOBILE-3528 core: Fix handlers order if one hasn't priority

src/core/classes/delegate-sorted.ts

@@ -86,14 +86,14 @@ export class CoreSortedDelegate<
             const handler = this.enabledHandlers[name];
             const data = <DisplayType> handler.getDisplayData();
 
-            data.priority = handler.priority;
+            data.priority = handler.priority || 0;
             data.name = handler.name;
 
             displayData.push(data);
         }
 
         // Sort them by priority.
-        displayData.sort((a, b) => (b.priority || 0) - (a.priority || 0));
+        displayData.sort((a, b) => b.priority! - a.priority!);
 
         this.loaded = true;
         this.sortedHandlersRxJs.next(displayData);

src/core/features/course/services/course-options-delegate.ts

@@ -450,7 +450,7 @@ export class CoreCourseOptionsDelegateService extends CoreDelegate<CoreCourseOpt
             promises.push(Promise.resolve(getFunction!.call(handler, courseWithOptions)).then((data) => {
                 handlersToDisplay.push({
                     data: data,
-                    priority: handler.priority,
+                    priority: handler.priority || 0,
                     prefetch: handler.prefetch && handler.prefetch.bind(handler),
                     name: handler.name,
                 });
@@ -467,7 +467,7 @@ export class CoreCourseOptionsDelegateService extends CoreDelegate<CoreCourseOpt
         handlersToDisplay.sort((
             a: CoreCourseOptionsHandlerToDisplay | CoreCourseOptionsMenuHandlerToDisplay,
             b: CoreCourseOptionsHandlerToDisplay | CoreCourseOptionsMenuHandlerToDisplay,
-        ) => (b.priority || 0) - (a.priority || 0));
+        ) => b.priority! - a.priority!);
 
         return handlersToDisplay;
     }

src/core/features/fileuploader/services/fileuploader-delegate.ts

@@ -183,13 +183,13 @@ export class CoreFileUploaderDelegateService extends CoreDelegate<CoreFileUpload
             }
 
             const data: CoreFileUploaderHandlerDataToReturn = handler.getData();
-            data.priority = handler.priority;
+            data.priority = handler.priority || 0;
             data.mimetypes = supportedMimetypes;
             handlers.push(data);
         }
 
         // Sort them by priority.
-        handlers.sort((a, b) => (a.priority || 0) <= (b.priority || 0) ? 1 : -1);
+        handlers.sort((a, b) => a.priority! <= b.priority! ? 1 : -1);
 
         return handlers;
     }

src/core/features/user/services/user-delegate.ts

@@ -311,7 +311,7 @@ export class CoreUserDelegateService extends CoreDelegate<CoreUserProfileHandler
         }));
 
         // Sort them by priority.
-        userData.handlers.sort((a, b) => (b.priority || 0) - (a.priority || 0));
+        userData.handlers.sort((a, b) => b.priority! - a.priority!);
         userData.loaded = true;
         userData.observable.next(userData.handlers);
     }