fix(DEFECT-1228): 编辑时切换功能码异常问题修复

寄存器数量为空时，默认值为1

@@ -307,15 +307,16 @@ public class TkDeviceScriptServiceImpl
     result.append(addrStr.substring(addrStr.length()-4));
 
     List<Integer> values = config.getRegisterVales();
+    Integer registerNum = config.getRegisterNum()==null?1:config.getRegisterNum();
     if(values ==null || values.isEmpty()){
       //读寄存器数据
-      result.append(modelHex(config.getRegisterNum()));
+      result.append(modelHex(registerNum));
     }else if(values.size() == 1){
       //单个写入
       result.append(modelHex(values.get(0)));
     }else{
       //多个写入
-      result.append(modelHex(config.getRegisterNum()));
+      result.append(modelHex(registerNum));
       result.append(multData(functionCode,values));
     }
     result.append(CrcUtils.getSendBuf(config.getCrc(),result.toString()));