hg: jdk9/sandbox/langtools: 8173804: javadoc throws UnsupportedOperationException: should not happen

[chris.hegarty at oracle.com]

Changeset: 9b784c8acd81
Author:    ksrini
Date:      2017-02-15 11:23 -0800
URL:       http://hg.openjdk.java.net/jdk9/sandbox/langtools/rev/9b784c8acd81

8173804: javadoc throws UnsupportedOperationException: should not happen
Reviewed-by: jjg

! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/util/Utils.java
+ test/jdk/javadoc/doclet/testMissingType/TestMissingType.java
+ test/jdk/javadoc/doclet/testMissingType/p/MissingType.java