LP#2091015: Fix patron reservation screen advance on failure

In the booking module, resolved an issue where clicking \"Confirm and Show Patron Reservations\" would advance to the reservation screen even if the reservation confirmation failed due to invalid inputs. The behavior is now corrected to remain on the reservation page when errors are present.

Release-Note: Prevents reservation screen navigation if reservation confirmation fails.

Steps to test:
- Navigate to the booking module.
- Try creating a reservation with invalid or incomplete data.
- Verify the error message appears.
- Confirm that clicking \"Confirm and Show Patron Reservations\" does not navigate to the next screen if errors exist.

Signed-off-by: IanSkelskey <ianskelskey@gmail.com>
Signed-off-by: Gina Monti <gmonti@biblio.org>
Signed-off-by: Jason Stephenson <jason@sigio.com>

Open-ILS/src/eg2/src/app/staff/booking/create-reservation-dialog.component.ts

@@ -183,8 +183,13 @@ export class CreateReservationDialogComponent
     };
 
     addBresvAndOpenPatronReservations = (): void => {
-        this.addBresv$()
-            .subscribe(() => this.openPatronReservations());
+        this.addBresv$().subscribe({
+            next: (response) => {
+                if (!('ilsevent' in response)) {
+                    this.openPatronReservations();
+                }
+            }
+        });
     };
 
     searchPatrons() {