Add --no-empty-sections flag to getChangelog task.

[ChrisCarini]

Pull Request Details

Add --no-empty-sections flag to getChangelog task.

Description

Add --no-empty-sections flag to getChangelog task. This flag omits empty sections from the output of getChangelog.

Related Issue

#167

Motivation and Context

See #167 for description and details.

How Has This Been Tested

• Added unit test
• Tested locally via local maven release in one of my OSS projects; see output below:

┌─(ChrisCarini)──(2023-04-29 @ 22:50:16)──( ~/GitHub/jetbrains/plugins/sample-intellij-plugin  (main) ) 
└─$ > ./gradlew getChangelog --unreleased --no-header --no-links --no-empty-sections --console=plain -q 
### Changed
- Upgrading IntelliJ from 2023.1 to 2023.1.1

### Deprecated
- Deprecated line


┌─(ChrisCarini)──(2023-04-29 @ 22:50:19)──( ~/GitHub/jetbrains/plugins/sample-intellij-plugin  (main) ) 
└─$ >

...vs...

┌─(ChrisCarini)──(2023-04-29 @ 22:50:19)──( ~/GitHub/jetbrains/plugins/sample-intellij-plugin  (main) ) 
└─$ > ./gradlew getChangelog --unreleased --no-header --no-links --console=plain -q 
### Added

### Changed
- Upgrading IntelliJ from 2023.1 to 2023.1.1

### Deprecated
- Deprecated line

### Removed

### Fixed

### Security


┌─(ChrisCarini)──(2023-04-29 @ 22:50:28)──( ~/GitHub/jetbrains/plugins/sample-intellij-plugin  (main) ) 
└─$ > 

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the README.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[ChrisCarini]

@YannCebron @hsz - Hello my friends! When you have a few minutes, would you mind taking a look at this PR? Having this feature would help save me some manual work in my release process for several plugins.

[hsz]

LGTM, thank you!