Fix: some random frontend fixes and coverage

src-ui/src/app/components/document-list/document-card-small/document-card-small.component.spec.ts

@@ -111,4 +111,12 @@ describe('DocumentCardSmallComponent', () => {
       fixture.debugElement.queryAll(By.directive(TagComponent))
     ).toHaveLength(6)
   })
+
+  it('should try to close the preview on mouse leave', () => {
+    component.popupPreview = {
+      close: jest.fn(),
+    } as any
+    component.mouseLeaveCard()
+    expect(component.popupPreview.close).toHaveBeenCalled()
+  })
 })

src-ui/src/app/components/document-list/document-card-small/document-card-small.component.ts

@@ -94,7 +94,7 @@ export class DocumentCardSmallComponent extends ComponentWithPermissions {
   }
 
   mouseLeaveCard() {
-    this.popupPreview.close()
+    this.popupPreview?.close()
   }
 
   get notesEnabled(): boolean {