fix:报告签名缺失问题修复

zt-module-qms/zt-module-qms-server/src/main/java/com/zt/plat/module/qms/business/reportdoc/service/ReportDocumentDataServiceImpl.java

@@ -814,8 +814,7 @@ public class ReportDocumentDataServiceImpl implements ReportDocumentDataService
                 sigIds.add(Long.parseLong(signatureId));
         });
         if(sigIds.isEmpty())
-            return "";
-
+            return docSigJson.toJSONString();
         List<ConfigUserSignatureDO> sigList = configUserSignatureService.getByIdList(sigIds);
         docSigJson.forEach((key, value) -> {
             JSONObject obj = docSigJson.getJSONObject( key);