clean code.

Author: gatorsmile

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/plans/PlanTest.scala

@@ -26,7 +26,6 @@ import org.apache.spark.sql.catalyst.util._
  * Provides helper methods for comparing plans.
  */
 abstract class PlanTest extends SparkFunSuite with PredicateHelper {
-
   /**
    * Since attribute references are given globally unique ids during analysis,
    * we must normalize them to check if two different queries are identical.