fix: handle empty icon name in notification item

[18202781743]

1. Modified DciIcon name property to use a fallback value when iconName
   is empty
2. Added default icon "application-x-desktop" to prevent missing icon
   display
3. Ensures notifications always show an appropriate icon even when none
   is specified

fix: 处理通知项中图标名称为空的情况

1. 修改 DciIcon 的 name 属性，在 iconName 为空时使用回退值
2. 添加默认图标 "application-x-desktop" 防止图标缺失显示
3. 确保即使未指定图标时通知也能显示适当的图标

pms: BUG-311315

Summary by Sourcery

Bug Fixes:

• Use "application-x-desktop" as a default icon when iconName is empty to prevent missing icon display in notifications

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在修改后的代码中，对 root.iconName 进行了空字符串检查，以确保 DciIcon 组件的 name 属性不会为空。

是否建议立即修改:

• 否，因为这次提交的修改是合理的，它避免了潜在的空字符串错误，这是一个改进。但是，如果有更多的上下文，比如 root.iconName 的来源和预期值，可能需要进一步的审查以确保这一改动是符合预期的。

[sourcery-ai]

Reviewer's Guide

Adds conditional logic to DciIcon name binding, defaulting to “application-x-desktop” when iconName is empty to ensure notifications always display an icon.

File-Level Changes

Change	Details	Files
Implement fallback icon for empty iconName	Use a ternary expression in DciIcon name property Default to “application-x-desktop” when iconName is blank	panels/notification/plugin/NotifyItemContent.qml

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[sourcery-ai]

Hey @18202781743 - I've reviewed your changes and they look great!

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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