DEVELOPMENT_METADATA_STRATEGY fails when branch doesn't match pattern even if not used

Consider the following config:

nebulaRelease {
    shortenedBranchPattern = /(?:(?:bug|chore|feature|refactor|release)(?:-|\/))?(\d+)/
}

With that config, version evaluation will fail from any branch that doesn't match that pattern (i.e. doesn't start with a number), even if it doesn't need to (i.e. if branch is in releaseBranchPatterns, e.g. master or HEAD) like:

FAILURE: Build failed with an exception.
* What went wrong:
A problem occurred configuring root project 'foo'.
> index is out of range 0..-1 (index = 0)

stacktrace:

index is out of range 0..-1 (index = 0)
org.gradle.api.ProjectConfigurationException: A problem occurred configuring root project 'foo'.
  Caused by: java.lang.IndexOutOfBoundsException: index is out of range 0..-1 (index = 0)
    at nebula.plugin.release.NetflixOssStrategies$BuildMetadata$__clinit__closure1.doCall(NetflixOssStrategies.groovy:57)
    at com.sun.proxy.$Proxy63.infer(Unknown Source)
    at org.ajoberstar.gradle.git.release.semver.PartialSemVerStrategy$infer$0.call(Unknown Source)
    at org.ajoberstar.gradle.git.release.semver.PartialSemVerStrategy$infer.call(Unknown Source)
    at org.ajoberstar.gradle.git.release.semver.StrategyUtil$_ApplyAllChainedPartialSemVerStrategy_infer_closure1.doCall(StrategyUtil.groovy:100)
    at org.ajoberstar.gradle.git.release.semver.StrategyUtil$ApplyAllChainedPartialSemVerStrategy.infer(StrategyUtil.groovy:99)
    at org.ajoberstar.gradle.git.release.semver.PartialSemVerStrategy$infer.call(Unknown Source)
    at org.ajoberstar.gradle.git.release.semver.SemVerStrategy.doInfer(SemVerStrategy.groovy:172)
    at org.ajoberstar.gradle.git.release.semver.SemVerStrategy.infer(SemVerStrategy.groovy:146)
    at org.ajoberstar.gradle.git.release.base.VersionStrategy$infer$1.call(Unknown Source)
    at org.ajoberstar.gradle.git.release.base.ReleasePluginExtension$DelayedVersion.infer(ReleasePluginExtension.groovy:121)
    at org.ajoberstar.gradle.git.release.base.ReleasePluginExtension$DelayedVersion.toString(ReleasePluginExtension.groovy:127)

Start at NetflixOssStrategies.groovy:57, in the DEVELOPMENT_METADATA_STRATEGY path, and trace how the shortenedBranchPattern match is used for release branches such as master or HEAD. Reproduce the configuration shown in the issue and verify that version evaluation no longer throws when an unmatched branch is covered by releaseBranchPatterns.