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java.lang.UnsupportedOperationException: empty collection	at org.apache.spark.rdd.RDD$$anonfun$reduce$1$$anonfun$apply$35.apply(RDD.scala:985)	at org.apache.spark.rdd.RDD$$anonfun$reduce$1$$anonfun$apply$35.apply(RDD.scala:985)	at scala.Option.getOrElse(Option.scala:121)	at org.apache.spark.rdd.RDD$$anonfun$reduce$1.apply(RDD.scala:985)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112)	at org.apache.spark.rdd.RDD.withScope(RDD.scala:358)	at org.apache.spark.rdd.RDD.reduce(RDD.scala:965)	at org.apache.spark.mllib.linalg.distributed.IndexedRowMatrix.numRows(IndexedRowMatrix.scala:66)	at org.apache.spark.mllib.linalg.distributed.IndexedRowMatrix.toCoordinateMatrix(IndexedRowMatrix.scala:128)	at esiptestbed.mudrod.utils.MatrixUtil.transposeMatrix(MatrixUtil.java:487)	at esiptestbed.mudrod.utils.SimilarityUtil.CalSimilarityFromVector(SimilarityUtil.java:62)	at esiptestbed.mudrod.semantics.SemanticAnalyzer.calTermSimfromMatrix(SemanticAnalyzer.java:69)	at esiptestbed.mudrod.semantics.SemanticAnalyzer.calTermSimfromMatrix(SemanticAnalyzer.java:60)	at esiptestbed.mudrod.weblog.process.UserHistoryAnalyzer.execute(UserHistoryAnalyzer.java:54)	at esiptestbed.mudrod.discoveryengine.WeblogDiscoveryEngine.process(WeblogDiscoveryEngine.java:202)	at esiptestbed.mudrod.main.MudrodEngine.startFullIngest(MudrodEngine.java:159)	at esiptestbed.mudrod.main.MudrodEngine.main(MudrodEngine.java:357)