Fix for non-empty a[name] tags in openJdk based javadocs.

openJdk based android javadoc contains <a name=... tags
that are non-empty. Currently they are being hidden,
causing badly formatted pages for some java.* classes
(missing text and random whitespace blocks).

This change makes the existing a[name] hiding rule
apply only to empty tags.

Test: make docs
Bug: 31700998
Change-Id: Ifa75bbabe308d7aed0cce6165c1113e5a382a121
(cherry picked from commit a7edd92c45)

tools/droiddoc/templates-sdk-dev/assets/css/default.css

@@ -3209,7 +3209,7 @@ table.jd-tagtable th {
 }
 
 /* offset the <a name=""> tags to account for sticky nav */
-body.reference a[name] {
+body.reference a[name]:empty {
   visibility: hidden;
   display: block;
   position: relative;