fix: tolerate damaged contribution files

src/ccma/storage/repository.py

@@ -83,6 +83,7 @@ class MemberRepository:
                     accepted_at=member.accepted_at,
                     membership_started_at=member.membership_started_at,
                 )
+                self.get_contributions(member.member_id)
                 if member.member_id != member_dir.name:
                     errors.append(f"{member_dir.name}/member.json: member_id stimmt nicht mit Ordner überein")
                 normalized_number = member.member_number.casefold().strip()
@@ -92,6 +93,8 @@ class MemberRepository:
                     )
                 elif normalized_number:
                     seen_numbers[normalized_number] = member.member_id
+            except RepositoryError as exc:
+                errors.append(str(exc))
             except (
                 OSError,
                 ValueError,
@@ -196,7 +199,15 @@ class MemberRepository:
         path = self._member_path(member_id) / "contributions.json"
         if not path.exists():
             return ContributionData()
-        return ContributionData.from_dict(read_json(path))
+        try:
+            raw = read_json(path)
+            if not isinstance(raw, dict):
+                raise TypeError("Wurzelelement muss ein JSON-Objekt sein")
+            return ContributionData.from_dict(raw)
+        except (OSError, ValueError, TypeError, json.JSONDecodeError) as exc:
+            raise RepositoryError(
+                f"{member_id}/contributions.json konnte nicht gelesen werden: {exc}"
+            ) from exc
 
     def save_contributions(self, member_id: str, data: ContributionData) -> None:
         self.get_member(member_id)