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更正 0232.用栈实现队列.md python代码

添加限制条件,仅在栈不为空的情况下才允许后续pop()和peek()的操作

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Original file line number	Diff line number	Diff line change
`@@ -304,6 +304,9 @@ class MyQueue:`
`304`	`304`	`2. 如果out没有元素,就把in里面的元素(除了第一个)依次pop后装进out里面`
`305`	`305`	`3. 直接把in剩下的元素pop出来,就是queue头部的`
`306`	`306`	`"""`
	`307`	`+ if self.empty:`
	`308`	`+ return None`
	`309`	`+`
`307`	`310`	`if self.stack_out:`
`308`	`311`	`return self.stack_out.pop()`
`309`	`312`	`else:`
`@@ -317,6 +320,9 @@ class MyQueue:`
`317`	`320`	`1. 查out有没有元素,有就把最上面的返回`
`318`	`321`	`2. 如果out没有元素,就把in最下面的返回`
`319`	`322`	`"""`
	`323`	`+ if self.empty:`
	`324`	`+ return None`
	`325`	`+`
`320`	`326`	`if self.stack_out:`
`321`	`327`	`return self.stack_out[-1]`
`322`	`328`	`else:`

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