MAHOUT-1367: Exception in thread "main" java.lang.NullPointerException, caused by not validating the input path.

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1546806 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1367: WikipediaXmlSplitter --> Exception in thread main java.lang.NullPointerException

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1546807 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1345: Enable randomised testing for all Mahout modules

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1546825 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1345: Enable randomised testing for all Mahout modules

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1546826 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1345: Enable randomised testing for all Mahout modules

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1546827 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1345: Added Carrot Randomized test annotations to base MahoutTestCase to avoid random Test failures (as suggested by Dawid Weiss).

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1546869 13f79535-47bb-0310-9956-ffa450edef68