Fix the NPE while post content is null

[JohnNiang]

What type of PR is this?

/kind bug
/area core
/milestone 2.20.x

What this PR does / why we need it:

This PR fixes the NPE while post content is null. See #7320 for more.

Which issue(s) this PR fixes:

Fixes #7320

Does this PR introduce a user-facing change?

修复通过接口创建文章可能导致无法发布和删除的问题

[Copilot]

Pull Request Overview

This PR addresses a bug where a NullPointerException occurs when post content is null by adding a null check and updating the excerpt generation logic.

• Added a test case (shouldGenerateBlankExcerptWhenContentIsNull) to validate that a blank excerpt is generated when content is null.
• Updated PostReconciler.java to return an empty string when either content or raw is blank.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
application/src/test/java/run/halo/app/core/reconciler/PostReconcilerTest.java	Added a test case to cover a null post content scenario
application/src/main/java/run/halo/app/core/reconciler/PostReconciler.java	Added a guard clause to return an empty excerpt if content values are blank

Comments suppressed due to low confidence (2)

application/src/main/java/run/halo/app/core/reconciler/PostReconciler.java:391

• The current condition returns an empty excerpt if either 'content' or 'raw' is blank. Confirm if this is the intended logic, or if a non-null value in one should be used to generate the excerpt.

if (StringUtils.isAnyBlank(content.getContent(), content.getRaw())) {

application/src/test/java/run/halo/app/core/reconciler/PostReconcilerTest.java:110

• Consider adding additional test cases for scenarios where only one of 'content' or 'raw' is blank, to ensure the behavior is consistent with the business requirements.

void shouldGenerateBlankExcerptWhenContentIsNull() {

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[ruibaby]

/lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.46%. Comparing base (60c2009) to head (540ac90).
Report is 7 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7321      +/-   ##
============================================
+ Coverage     57.18%   57.46%   +0.28%     
- Complexity     4066     4093      +27     
============================================
  Files           721      721              
  Lines         24546    24594      +48     
  Branches       1612     1621       +9     
============================================
+ Hits          14036    14133      +97     
+ Misses         9882     9823      -59     
- Partials        628      638      +10     

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[ruibaby]

/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ruibaby

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