Restore empty line

Author: ghostbuster91

compiler/test/dotty/tools/DottyTest.scala

@@ -13,6 +13,7 @@ import Types._, Symbols._, Decorators._
 import dotc.core.Decorators._
 import dotc.ast.tpd
 import dotc.Compiler
+
 import dotc.core.Phases.Phase
 
 trait DottyTest extends ContextEscapeDetection {