Prevent non-existent help handbook from populating the main handbook table of contents.

conduits/docconduit/kpalmdoc.desktop

@@ -56,7 +56,13 @@ GenericName[zh_TW]=PalmDOC 轉換器
 Exec=kpalmdoc
 Icon=kpalmdoc
 Type=Application
-DocPath=kpalmdoc/index.html
+# Restore the following key and remove this comment when a help handbook
+# is written. Disabling this key prevents populating the main handbook
+# table of contents with a non-existent document, which results in a
+# main handbook error message of
+# 'There is no documentation available for /xyz/index.html.'
+# Also disable this key when there exists only a useless template handbook.
+# DocPath=kpalmdoc/index.html
 Terminal=false
 X-TDE-StartupNotify=true
 X-DCOP-ServiceType=Unique