fix(populate): 跳过空串关联 id，避免可选 Relation 存 "" 时 $in 转 ObjectId 抛 CastError 整页 500

bump 0.7.11

src/forMongo/MongoShrimpCrud.ts

@@ -79,9 +79,10 @@ export class MongoShrimpCrud<T> implements ShrimpCrud<T> {
             const allRefIds = new Set<string>()
             for (const item of items) {
                 const val = (item as any)[pop.key]
+                // 跳过空串：可选 Relation 常存 ""，混进 { _id: { $in } } 会让 Mongoose 转 ObjectId 抛 CastError、整页 500。
                 if (Array.isArray(val)) {
-                    val.forEach((id: any) => { if (id != null) allRefIds.add(String(id)) })
-                } else if (val != null) {
+                    val.forEach((id: any) => { if (id != null && id !== "") allRefIds.add(String(id)) })
+                } else if (val != null && val !== "") {
                     allRefIds.add(String(val))
                 }
             }