issue-117 "Could not normalize path for file" error occurs on Windows when $testRunTask.classpath.asPath is called

[Problem]
'gradle testDebug' failed on Window and Mac

[RootCause]
$testRunTask.classpath.asPath throw exception

[Solution]
remove log.debug("jUnit classpath: $testRunTask.classpath.asPath")

[Test]
Run 'gradle testDebug'

[ISSUE Link]
https://github.com/robolectric/robolectric-gradle-plugin/issues/117