Bug fix : Fix error return when SET NX/XX command fails #1343
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Fix a bug in the process of executing the SET command.
When the
SET
command contains parameters:NX
orXX
and the execution fails, the wrong RESP information will be written to the i/o buffer:*-1\r\n
(Null Array), in fact, the correct return format should be:$-1\r\n
(Null Bulk String), this wrong return will cause some Redis clients to generate some exceptions.