fix: [session] Issues of session name

[Kakueeen]

as title

Log: fix bug
Bug: https://pms.uniontech.com/bug-view-299557.html
Bug: https://pms.uniontech.com/bug-view-299555.html
Bug: https://pms.uniontech.com/bug-view-299391.html

[deepin-ci-robot]

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This pull-request has been approved by: Kakueeen
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[deepin-ci-robot]

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关键摘要:

• 在SessionNameInputDialog类中，lineEdit的setValidator方法被调用时，应该检查lineEdit是否为nullptr以避免潜在的空指针异常。
• SessionNameInputDialog::handleButtonClicked方法中，isSwitchTo变量被设置为true，但没有对应的注释说明其用途。
• SessionListView::runInputDialog方法中，dialog->exec()返回QDialog::Accepted时，应该检查name是否为空，以避免不必要的处理。
• SessionItemWidgetPrivate::runInputDialog方法中，lineEdit的setText方法被调用时，应该检查lineEdit是否为nullptr以避免潜在的空指针异常。
• SessionItemWidgetPrivate::runInputDialog方法中，handler函数被调用时，应该检查name是否为空，以避免不必要的处理。

是否建议立即修改:
是