[rfc][icedtea-web] fixed another exception from get attributes

[Jiri Vanek]

Reported today by Xerxes, test is longer then fix :)
Also the page with it was added to http://icedtea.classpath.org/wiki/IcedTea-Web-Tests - 
http://joliclic.free.fr/html/object-tag/en/object-java.html

Thanx for keeping en eye on head Xerxes!

J.

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