MOBILE-4723 my: Allow again showing myoverview in my courses page

src/core/classes/delegate.ts

@@ -191,9 +191,9 @@ export class CoreDelegate<HandlerType extends CoreDelegateHandler> {
      * @returns Function returned value or default value.
      */
     protected hasFunction(handlerName: string, fnName: string, onlyEnabled: boolean = true): boolean {
-        const handler = onlyEnabled ? this.enabledHandlers[handlerName] : this.handlers[handlerName];
+        const handler = this.getHandler(handlerName, onlyEnabled);
 
-        return handler && typeof handler[fnName] == 'function';
+        return handler && typeof handler[fnName] === 'function';
     }
 
     /**
@@ -204,7 +204,7 @@ export class CoreDelegate<HandlerType extends CoreDelegateHandler> {
      * @returns If the handler is registered or not.
      */
     hasHandler(name: string, enabled: boolean = false): boolean {
-        return enabled ? this.enabledHandlers[name] !== undefined : this.handlers[name] !== undefined;
+        return this.getHandler(name, enabled) !== undefined;
     }
 
     /**

src/core/features/block/components/block/block.ts

@@ -101,7 +101,7 @@ export class CoreBlockComponent implements OnChanges, OnDestroy {
     }
 
     /**
-     * On destroy of the component, clear up any subscriptions.
+     * @inheritdoc
      */
     ngOnDestroy(): void {
         this.blockSubscription?.unsubscribe();

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

@@ -114,7 +114,8 @@ export class CoreBlockDelegateService extends CoreDelegate<CoreBlockHandler> {
      * @inheritdoc
      */
     async isEnabled(): Promise<boolean> {
-        return !this.areBlocksDisabledInSite();
+        // Always return true, to allow displaying my overview even if all blocks are disabled, to avoid having an empty My Courses.
+        return true;
     }
 
     /**

src/core/features/courses/pages/my/my.ts

@@ -120,7 +120,7 @@ export class CoreCoursesMyPage implements OnInit, OnDestroy, AsyncDirective {
                 );
 
                 // My overview block should always be in main blocks, but check side blocks too just in case.
-                this.loadedBlock = blocks.mainBlocks.concat(blocks.sideBlocks).find((block) => block.name == 'myoverview');
+                this.loadedBlock = blocks.mainBlocks.concat(blocks.sideBlocks).find((block) => block.name === 'myoverview');
                 this.hasSideBlocks = supportsMyParam && CoreBlockDelegate.hasSupportedBlock(blocks.sideBlocks);
 
                 await CoreWait.nextTicks(2);