fix: 优化保存后关闭提示

[myk1343]

优化保存后关闭提示

Bug: https://pms.uniontech.com/bug-view-269141.html
Log: 优化保存后关闭提示

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在save函数中，对d_PageContext()->_dirty的赋值操作可能是不必要的，因为save函数的返回值已经包含了保存操作的成功与否信息。
• 代码中没有对file参数进行有效性检查，可能会导致未处理的异常。

是否建议立即修改:

• 是

[rb-union]

[是否满足兼容性要求] Y
[是否满足commit提交规范] Y
[是否满足编码规范] Y
[Review结论] Pass
[Fail原因] N/A

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: myk1343, pengfeixx

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• debian/deepin/OWNERS

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[myk1343]

/merge