Call ensureCompleted even if has NoCompleter

Author: nicolasstucki

compiler/src/dotty/tools/dotc/core/Symbols.scala

@@ -639,10 +639,7 @@ object Symbols {
      *  For already loaded trees, we maintain the referenced ids in an attachment.
      */
     def treeContaining(id: String)(implicit ctx: Context): Tree = {
-      denot.infoOrCompleter match {
-        case _: NoCompleter =>
-        case _ => denot.ensureCompleted()
-      }
+      denot.ensureCompleted()
       myTree match {
         case fn: TreeProvider =>
           if (id.isEmpty || fn.mightContain(id)) {