Fix PurgeNpmAlphaVersion to not require properties used by base class (#239)

Author: labkey-susanh

README.md

@@ -12,6 +12,10 @@ If you are making changes to the plugins, please see the [internal docs](https:/
 on how to do that, including how to develop and test locally and the versioning information.
 
 ## Release Notes
+### 7.2.1
+*Released* 23 December 2025
+(Earliest compatible LabKey version: 25.10)
+- Fix `PurgeNpmAlphaVersions` task
 
 ### 7.2.0
 *Released*: 11 December 2025

src/main/groovy/org/labkey/gradle/task/PurgeNpmVersions.groovy

@@ -11,6 +11,7 @@ import org.gradle.api.DefaultTask
 import org.gradle.api.GradleException
 import org.gradle.api.provider.Property
 import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.Optional
 import org.gradle.api.tasks.TaskAction
 import org.labkey.gradle.util.TaskUtils
 
@@ -22,9 +23,11 @@ abstract class PurgeNpmVersions extends DefaultTask
     private static final String VERSION_LIST_PROP = "versionList"
 
     @Input
+    @Optional
     final abstract Property<String> packageName = project.objects.property(String).convention((project.hasProperty(PACKAGE_NAME_PROP) ? (String) project.property(PACKAGE_NAME_PROP) : null))
 
     @Input
+    @Optional
     final abstract Property<String> versionList = project.objects.property(String).convention((project.hasProperty(VERSION_LIST_PROP) ? (String) project.property(VERSION_LIST_PROP) : null))
 
     @Input