dont empty cart if funds insufficient

src/ez_lan_manager/components/SeatingPlanInfoBox.py

@@ -17,12 +17,21 @@ class SeatingPlanInfoBox(Component):
     seat_price: Decimal = Decimal("0")
     is_blocked: bool = False
     has_user_ticket = False
+    booking_button_text = ""
 
-    @event.on_page_change
+    @event.on_populate
     async def check_ticket(self) -> None:
         if self.session[SessionStorage].user_id:
             user_ticket = await self.session[TicketingService].get_user_ticket(self.session[SessionStorage].user_id)
             self.has_user_ticket = not (user_ticket is None)
+            self.booking_button_text = "Buchen" if self.has_user_ticket else "Ticket kaufen"
+            self.force_refresh()
+
+    async def purchase_clicked(self):
+        if self.has_user_ticket:
+            await self.purchase_cb()
+        else:
+            self.session.navigate_to("./buy_ticket")
 
     def build(self) -> Component:
         if not self.show:
@@ -47,7 +56,7 @@ class SeatingPlanInfoBox(Component):
                  style=TextStyle(fill=self.session.theme.neutral_color), overflow="wrap", justify="center"),
             Button(
                 Text(
-                    "Buchen" if self.has_user_ticket else "Ticket kaufen",
+                    text=self.booking_button_text,
                     margin=1,
                     style=TextStyle(fill=self.session.theme.neutral_color, font_size=1.1),
                     overflow="wrap",
@@ -59,7 +68,7 @@ class SeatingPlanInfoBox(Component):
                 margin=1,
                 grow_y=False,
                 is_sensitive=not self.is_booking_blocked,
-                on_press=self.purchase_cb if self.has_user_ticket else partial(self.session.navigate_to, "./buy_ticket")
+                on_press=self.purchase_clicked
             ) if self.session[SessionStorage].user_id else Text(f"Du musst eingeloggt sein um einen Sitzplatz zu buchen", margin=1,
                  style=TextStyle(fill=self.session.theme.neutral_color), overflow="wrap", justify="center"),
             min_height=10

src/ez_lan_manager/components/ShoppingCartAndOrders.py

@@ -85,7 +85,8 @@ class ShoppingCartAndOrders(Component):
                     show_popup_task = create_task(self.show_popup("Guthaben nicht ausreichend", True))
                 else:
                     show_popup_task = create_task(self.show_popup("Unbekannter Fehler", True))
-        self.session[CateringService].save_cart(self.session[SessionStorage].user_id, [])
+            else:
+                self.session[CateringService].save_cart(self.session[SessionStorage].user_id, [])
         self.order_button_loading = False
         if not show_popup_task:
             show_popup_task = create_task(self.show_popup("Bestellung erfolgreich aufgegeben!", False))