0.12.0版本last 读不存在的测点报权限异常导致没法执行closeResultSet(wrapper)

1.首先用户是在root.sg1存储组有读写权限的
2.如果root.sg1.d1.s1 存在，则select last sg1.d1.s1 from root是正常执行的
3.如果root.sg1.d1.s2 不存在，select last sg1.d1.s1 ,sg1.d1.s2 from root也是正常执行的
4.如果root.sg1.d1.s1，root.sg1.d1.s2 全都不存在，select last sg1.d1.s1 ,sg1.d1.s2 from root会报602，没权限执行last,这个时候
finally块执行closeResultSet(wrapper)，报wrapper空指针，也不知道此种情况下是否会释放资源

Reproduce the reported 0.12.0 behavior with the three SQL cases against root.sg1, including the case where all referenced measurements are absent. Trace the handling of LAST and the finally block calling closeResultSet(wrapper); done means the absent-measurement query does not report an incorrect permission error or trigger a null-pointer failure, and resource cleanup is verified.

Written by the indexing model from the issue text.