NPE in GroovyScriptEngine.getResourceConnection(String)

From Armin on the mailing-list:

Hello Groovy devs,

i found a NPE GroovyScriptEngine.getResourceConnection(String), when no script roots has been specified.

Here is a small test.

 @Test(expected =  ResourceException)
 void "execute groovy script on unknown script root should cause some meaningfull exception"() {
  String[] emptyScriptRoots = []
  GroovyScriptEngine gse = new GroovyScriptEngine(emptyScriptRoots)
  gse.run("unknownScriptName", "")
 }

Instead of getting a meaningfull exception, that the resource "unknownScriptName" can not be found, I get a NPE, because of an implicit
"throw null" statetement within GroovyScriptEngine.getResourceConnection(String)

I'm using Groovy 1.6.4.