hg: jdk10/jdk10/langtools: 8179704: doclet crashes with an empty package.html

[kumar.x.srinivasan at oracle.com]

Changeset: 6f15d35d31df
Author:    ksrini
Date:      2017-07-05 13:46 -0700
URL:       http://hg.openjdk.java.net/jdk10/jdk10/langtools/rev/6f15d35d31df

8179704: doclet crashes with an empty package.html
Reviewed-by: jjg

! src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/HtmlDocletWriter.java
! test/jdk/javadoc/doclet/testPackageHtml/TestPackageHtml.java
+ test/jdk/javadoc/doclet/testPackageHtml/pkg2/X.java
+ test/jdk/javadoc/doclet/testPackageHtml/pkg2/package.html
+ test/jdk/javadoc/doclet/testPackageHtml/pkg3/X.java
+ test/jdk/javadoc/doclet/testPackageHtml/pkg3/package.html
+ test/jdk/javadoc/doclet/testPackageHtml/pkg4/X.java
+ test/jdk/javadoc/doclet/testPackageHtml/pkg4/package.html