Fix null RT correction selection path

[YukiMatsuzawa]

RT correction can fail when the optional peak selection file path is null while ParameterBase.ParametersAsText() serializes parameters. This change makes parameter output null-safe and keeps the path owned by ReferenceBaseParameter instead of exposing another forwarding property on ParameterBase.

The console configuration parser and RT correction process now read and write the path through ReferenceFileParam, preserving the existing behavior for configured selection files.

Validation: dotnet build tests\MSDIAL5\MsdialCoreTestApp\MsdialCoreTestApp.csproj --no-restore --verbosity minimal

[Copilot]

Pull request overview

This PR addresses a null-handling bug during RT correction parameter serialization by ensuring the optional “RT correction peak selection file path” can be null without throwing, and by routing read/write access through ReferenceFileParam rather than a ParameterBase forwarding property.

Changes:

• Updated RT correction pipeline and console config parsing to use parameter.ReferenceFileParam.RtCorrectionPeakSelectionFilePath.
• Made ParameterBase.ParametersAsText() null-safe when emitting the RT correction peak selection file path.
• Removed the ParameterBase.RtCorrectionPeakSelectionFilePath forwarding property in favor of ReferenceBaseParameter ownership.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
tests/MSDIAL5/MsdialCoreTestApp/Process/RetentionTimeCorrectionProcess.cs	Reads the selection path from ReferenceFileParam and uses a null-safe emptiness check before applying a selection file.
tests/MSDIAL5/MsdialCoreTestApp/Process/EicProcess.cs	Writes the selection path to ReferenceFileParam during RT correction setup.
tests/MSDIAL5/MsdialCoreTestApp/Parser/ConfigParser.cs	Parses the config key into ReferenceFileParam.RtCorrectionPeakSelectionFilePath to preserve configured behavior.
src/MSDIAL5/MsdialCore/Parameter/ParameterBase.cs	Removes the forwarding property and makes parameter text output null-safe for the selection path.

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