fix: preflight member records before rules

src/ccma/ui/main_window.py

@@ -7,7 +7,7 @@ from ccma import __version__
 from ccma.config import AppConfig
 from ccma.domain.models import HousekeeperFinding, Member
 from ccma.services.housekeeper import Housekeeper
-from ccma.storage.repository import MemberRepository
+from ccma.storage.repository import MemberRepository, RepositoryError
 from ccma.ui.dialogs import NewMemberDialog
 from ccma.ui.icons import IconStore
 from ccma.ui.member_tab import MemberTab
@@ -264,7 +264,12 @@ class MainWindow(ttk.Frame):
         key = f"member:{member_id}"
         if self.tabs.focus(key):
             return
-        member = self.repository.get_member(member_id)
+        try:
+            member = self.repository.get_member(member_id)
+        except RepositoryError as exc:
+            self.status_var.set(str(exc))
+            messagebox.showerror("Mitgliederakte beschädigt", str(exc), parent=self)
+            return
         tab = MemberTab(
             self.notebook,
             self.repository,