Error handling on empty damaged parts

src/expert-claim/expert-claim.service.ts

@@ -4655,7 +4655,7 @@ export class ExpertClaimService {
       previousNorm,
     );
 
-    const nextNorm = body.selectedParts.map((p) =>
+    const nextNormRaw = body.selectedParts.map((p) =>
       sanitizeDamageSelectedPartV2(
         {
           id: p.id ?? null,
@@ -4669,6 +4669,20 @@ export class ExpertClaimService {
       ),
     );
 
+    // Drop ghost entries: internal parts with neither a catalog id nor a name
+    // (these are frontend artifacts from uninitialised form rows).
+    const nextNorm = nextNormRaw.filter((p) => {
+      if (p.id != null) return true;
+      return String(p.name ?? "").trim().length > 0;
+    });
+
+    if (nextNorm.length === 0) {
+      throw new BadRequestException(
+        "selectedParts must contain at least one identifiable part. " +
+          "Each entry must have a numeric catalog id or a non-empty name.",
+      );
+    }
+
     const matchPreviousIndex = (
       next: (typeof nextNorm)[0],
       previous: typeof previousNorm,