hg: amber/amber: fixing NPE bug that was provoking several regression tests to fail

[vicente.romero at oracle.com]

Changeset: 2a8310d5265d
Author:    vromero
Date:      2020-02-13 18:06 -0500
URL:       https://hg.openjdk.java.net/amber/amber/rev/2a8310d5265d

fixing NPE bug that was provoking several regression tests to fail

! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/TypeEnter.java
! test/langtools/tools/javac/sealed/SealedCompilationTests.java