fix: After connecting to Pika via telnet and pressing Enter, it causes Pika core dump

[Mixficsol]

使用 telnet 连上 Pika 之后直接回车，会让 Pika 接受到一个 "\r\n" 的包，最终会导致 Pika Core 在了 std::string opt = argvs[0][0]; 这里，PR 增加了对空命令包判断，测试后发现没有之前 core 的问题
#3095

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