fix: can't query Notify for notification

[18202781743]

Fallback to appName if AppName is null fetching from settings.

pms: TASK-366403

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, yixinshark

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[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在修改后的代码中，tsAppName变量被初始化为appName，然后通过检查appNameValue是否为空来决定是否覆盖它。这种做法可能会导致tsAppName的值在某些情况下不正确。
• strBody.replace函数使用了Qt::CaseInsensitive标志，这可能会导致不区分大小写的替换，这可能不是预期的行为。

是否建议立即修改:

• 是

建议的修改:

• 确认tsAppName的初始化逻辑是否符合预期。如果appNameValue为空，应该保留appName的值，而不是将其设置为空字符串。
• 如果strBody.replace函数的替换逻辑是区分大小写的，应该移除Qt::CaseInsensitive标志，以确保替换操作按预期工作。如果确实需要不区分大小写的替换，应该明确这一点，并在代码中添加相应的注释。

[18202781743]

/forcemerge

[deepin-bot]

This pr force merged! (status: blocked)