When executing javadoc with -overview in ja locale, the window title of
the overview-summary.html has unnecessary string "(null)".

The correct window title should be just "Overview" in Japanese but it's
"Overview (null)".
 
% javadoc -J-version
java version "1.4.1-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-beta-b13)
Java HotSpot(TM) Client VM (build 1.4.1-beta-b13, mixed mode)
%

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The command line to reproduce is like:

% env LANG=ja javadoc -J-mx256m -source 1.4 -overview <directory-for-overview>/overview.html -sourcepath ~/apisrc/fcs/src -d ~/fcs/html/ja/api <package-name>

###@###.### 2002-06-03