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java.lang.NullPointerException: 	at scala.collection.immutable.StringOps$.length$extension(StringOps.scala:47)	at scala.collection.immutable.StringOps.length(StringOps.scala:47)	at scala.collection.IndexedSeqOptimized$class.isEmpty(IndexedSeqOptimized.scala:27)	at scala.collection.immutable.StringOps.isEmpty(StringOps.scala:29)	at scala.collection.TraversableOnce$class.nonEmpty(TraversableOnce.scala:111)	at scala.collection.immutable.StringOps.nonEmpty(StringOps.scala:29)	at org.apache.spark.ml.attribute.AttributeGroup.(AttributeGroup.scala:42)	at org.apache.spark.ml.attribute.AttributeGroup.(AttributeGroup.scala:65)	at org.apache.spark.ml.feature.VectorAssembler.transform(VectorAssembler.scala:94)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)