EagleTest.testSupervisedBatch occasionally fails

[yamalight]

See Travis logs for more info, here's a partial copy of output:

testSupervisedBatch(org.aksw.limes.core.ml.EagleTest)  Time elapsed: 1.122 sec  <<< FAILURE!
java.lang.AssertionError: null
    at org.aksw.limes.core.ml.EagleTest.testSupervisedBatch(EagleTest.java:104)
Running org.aksw.limes.core.ml.DecisionTreeLearningTest
11:00:07.214 [main] INFO  org.aksw.limes.core.ml.algorithm.decisionTreeLearning.DecisionTreeLearning - Getting initial training mapping...
11:00:07.724 [main] INFO  org.aksw.limes.core.ml.algorithm.decisionTreeLearning.DecisionTreeLearning - false & true = false
11:00:07.724 [main] INFO  org.aksw.limes.core.ml.algorithm.decisionTreeLearning.DecisionTreeLearning - Training Data contains only positive/negative examples. Using Wombat
11:00:08.234 [main] INFO  org.aksw.limes.core.ml.algorithm.decisionTreeLearning.DecisionTreeLearning - true & true = true
11:00:08.265 [main] INFO  org.aksw.limes.core.ml.algorithm.decisionTreeLearning.DecisionTreeLearning - Building classifier....
11:00:08.404 [main] INFO  org.aksw.limes.core.ml.algorithm.decisionTreeLearning.DecisionTreeLearning - Parsing tree to LinkSpecification...
11:00:08.407 [main] INFO  org.aksw.limes.core.ml.algorithm.decisionTreeLearning.DecisionTreeLearning - Learned LinkSpecification: (jaccard(x.surname,y.surname)|1.00, 1.0, null, null)
digraph J48Tree {
N0 [label="positive (2.0/1.0)" shape=box style=filled ]
}

[MSherif]

That is because of the non-deterministic nature of EAGLE. Test removed