Fix undefined title thjing

src-ui/src/app/components/common/page-header/page-header.component.spec.ts

@@ -43,6 +43,13 @@ describe('PageHeaderComponent', () => {
     expect(titleSpy).toHaveBeenCalledWith(`Foo Bar - ${environment.appTitle}`)
   })
 
+  it('should set html title to just the app title until a title is available', () => {
+    const titleSpy = jest.spyOn(titleService, 'setTitle')
+    fixture.componentRef.setInput('title', undefined)
+    fixture.detectChanges()
+    expect(titleSpy).toHaveBeenCalledWith(environment.appTitle)
+  })
+
   it('should copy id to clipboard, reset after 3 seconds', () => {
     jest.useFakeTimers()
     fixture.componentRef.setInput('id', 42)

src-ui/src/app/components/common/page-header/page-header.component.ts

@@ -27,7 +27,10 @@ export class PageHeaderComponent {
 
   constructor() {
     effect(() => {
-      this.titleService.setTitle(`${this.title()} - ${environment.appTitle}`)
+      const title = this.title()
+      this.titleService.setTitle(
+        title ? `${title} - ${environment.appTitle}` : environment.appTitle
+      )
     })
   }