Extra whitespace in ExecutorExitCode

core/src/main/scala/spark/executor/ExecutorExitCode.scala

@@ -12,12 +12,15 @@ private[spark]
 object ExecutorExitCode {
   /** The default uncaught exception handler was reached. */
   val UNCAUGHT_EXCEPTION = 50
+
   /** The default uncaught exception handler was called and an exception was encountered while
       logging the exception. */
   val UNCAUGHT_EXCEPTION_TWICE = 51
+
   /** The default uncaught exception handler was reached, and the uncaught exception was an 
       OutOfMemoryError. */
   val OOM = 52
+
   /** DiskStore failed to create a local temporary directory after many attempts. */
   val DISK_STORE_FAILED_TO_CREATE_DIR = 53