Merge branch 'qtz5' of SH-Arbitrate/Arbitrate-Backend into dev

ruoyi-system/src/main/java/com/ruoyi/wisdomarbitrate/service/impl/CaseApplicationServiceImpl.java

                                         //发起签署
                                         sealSignRecord.setFilename(fileName);
                                         String arbitratorId = caseApplication2.getArbitratorId();
-                                        if (arbitratorId != null) {
+                                        if (StringUtils.isNotEmpty(arbitratorId)) {
                                             SysUser sysUser = sysUserMapper.selectUserById(Long.valueOf(arbitratorId));
                                             if (sysUser == null) {
                                                 return AjaxResult.error();
                                                 //发起签署
                                                 sealSignRecord.setFilename(fileName);
                                                 String arbitratorId = caseApplication2.getArbitratorId();
-                                                if (arbitratorId != null) {
+                                                if (StringUtils.isNotEmpty(arbitratorId)) {
                                                     SysUser sysUser = sysUserMapper.selectUserById(Long.valueOf(arbitratorId));
                                                     if (sysUser == null) {
                                                         return AjaxResult.error();