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java.lang.NullPointerException: null	at org.codehaus.mojo.versions.ordering.NumericVersionComparator.compare(NumericVersionComparator.java:48)	at org.artifactory.addon.gems.index.merge.NvpComparator.compare(NvpComparator.java:30)	at org.artifactory.addon.gems.index.merge.NvpComparator.compare(NvpComparator.java:1)	at org.artifactory.addon.gems.index.merge.DoubleIterator$Merge.computeNext(DoubleIterator.java:47)	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)	at com.google.common.collect.Iterators$7.computeNext(Iterators.java:650)	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)	at org.artifactory.addon.gems.helpers.UpdateIndexHelper$LatestVersionIterator.computeNext(UpdateIndexHelper.java:196)	at org.artifactory.addon.gems.helpers.UpdateIndexHelper$LatestVersionIterator.computeNext(UpdateIndexHelper.java:1)	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)	at org.artifactory.addon.gems.index.merge.DoubleIterator$Delete.computeNext(DoubleIterator.java:64)	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)	at org.artifactory.addon.gems.helpers.UpdateIndexHelper.calcEstimatedSize(UpdateIndexHelper.java:163)	at org.artifactory.addon.gems.helpers.UpdateIndexHelper.updateAndSave(UpdateIndexHelper.java:120)	at org.artifactory.addon.gems.index.GemsLocalIndexHandler.doUpdateIndex(GemsLocalIndexHandler.java:192)	at org.artifactory.addon.gems.index.GemsLocalIndexHandler.updateIndex(GemsLocalIndexHandler.java:141)	at org.artifactory.addon.gems.index.GemsLocalIndexHandler$UpdateIndicesJob.onExecute(GemsLocalIndexHandler.java:260)	at org.artifactory.schedule.quartz.QuartzCommand.execute(QuartzCommand.java:52)	at org.quartz.core.JobRunShell.run(JobRunShell.java:202)	at org.artifactory.schedule.ArtifactoryConcurrentExecutor$RunnableWrapper.run(ArtifactoryConcurrentExecutor.java:104)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)