fix(datetime): guard against empty date format string

[MyLeeJiEun]

1. Add early return when the format string is empty after stripping the year token
2. Prevent out-of-bounds access on format.at(0) with an empty format

Log: Avoid potential crash when a short date format becomes empty after year removal
Influence: Prevents dock crash on empty short date format

fix(datetime): 防止短日期格式字符串为空

1. 在移除年份标记后格式字符串为空时提前返回
2. 避免空格式串上 format.at(0) 的越界访问

Log: 避免短日期格式移除年份后为空导致的潜在崩溃
PMS: TASK-395933
Influence: 修复空短日期格式可能导致的崩溃

Summary by Sourcery

Bug Fixes:

• Prevent a potential dock crash when removing the year token leaves the short date format empty.

[sourcery-ai]

Sorry @MyLeeJiEun, you've used your own review budget of 250,000 diff characters for the last 7 days.

You can request another review in 4 hours and 13 minutes by commenting @sourcery-ai review. Upgrade to get a review now.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds an early exit for short-date formats that become empty after year removal, preventing the subsequent format.at(0) access from causing a dock crash.

File-Level Changes

Change	Details	Files
Guard short-date format processing after removing year tokens.	Return immediately when the resulting format string is empty. Prevent accessing the first character of an empty format string.	plugins/dde-dock/datetime/regionFormat.cpp

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[deepin-ci-robot]

Hi @MyLeeJiEun. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

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[MyLeeJiEun]

/forcemerge

[deepin-bot]

This pr force merged! (status: blocked)