Fix tabs selection to work without content and add test

Co-authored-by: Lipata <[email protected]>

Author: Copilot

projects/igniteui-angular/src/lib/tabs/tab-header.directive.ts

@@ -40,9 +40,7 @@ export abstract class IgxTabHeaderDirective implements IgxTabHeaderBase {
     /** @hidden */
     @HostListener('click')
     public onClick() {
-        if (this.tab.panelComponent) {
-            this.tabs.selectTab(this.tab, true);
-        }
+        this.tabs.selectTab(this.tab, true);
     }
 
     /** @hidden */

projects/igniteui-angular/src/lib/tabs/tabs/tabs.component.spec.ts

@@ -865,6 +865,36 @@ describe('IgxTabs', () => {
             fixture.detectChanges();
             expect(tabsComp.selectedIndicator.nativeElement.style.visibility).toBe('hidden');
         });
+
+        it('should allow tab selection by clicking on tabs without content', fakeAsync(() => {
+            // Initially tab 1 (index 1) is selected
+            expect(tabsComp.selectedIndex).toBe(1);
+            expect(tabItems[1].selected).toBe(true);
+            expect(tabItems[0].selected).toBe(false);
+            expect(tabItems[2].selected).toBe(false);
+
+            // Click on tab 0 (no content)
+            headerElements[0].dispatchEvent(new Event('click', { bubbles: true }));
+            tick(200);
+            fixture.detectChanges();
+
+            // Should now be selected
+            expect(tabsComp.selectedIndex).toBe(0);
+            expect(tabItems[0].selected).toBe(true);
+            expect(tabItems[1].selected).toBe(false);
+            expect(tabItems[2].selected).toBe(false);
+
+            // Click on tab 2 (no content)
+            headerElements[2].dispatchEvent(new Event('click', { bubbles: true }));
+            tick(200);
+            fixture.detectChanges();
+
+            // Should now be selected
+            expect(tabsComp.selectedIndex).toBe(2);
+            expect(tabItems[2].selected).toBe(true);
+            expect(tabItems[0].selected).toBe(false);
+            expect(tabItems[1].selected).toBe(false);
+        }));
     });
 
     describe('Tabs-only Mode With Initial Selection Set on Tabs Component Tests', () => {