试验编号bug

blade-service/blade-business/src/main/java/org/springblade/business/service/impl/TrialNumberRuleServiceImpl.java

@@ -115,7 +115,7 @@ public class TrialNumberRuleServiceImpl extends BaseServiceImpl<TrialNumberRuleM
                             return "";
                         }
                     });
-                    trialNumber.append(result);
+                    trialNumber.append(result==null?"":result);
                 }else {
                     trialNumber.append("SNY");
                 }