Undo PsiTypeMapper fix.

Author: unv-unv

java-language-impl/src/main/java/com/intellij/java/language/impl/psi/PsiTypeMapper.java

@@ -69,10 +69,10 @@ public PsiType visitTypeVariable(final PsiTypeVariable var) {
     return var;
   }
 
-//  @Override
-//  public PsiType visitBottom(final Bottom bottom) {
-//    return bottom;
-//  }
+  @Override
+  public PsiType visitBottom(final Bottom bottom) {
+    return bottom;
+  }
 
   @Override
   public PsiType visitCapturedWildcardType(final PsiCapturedWildcardType type) {