[rfc][icedtea-web] fix the empty string in codebase

[Jiri Vanek]

I have recently encountered an app, which failed to run, because of malformed jnlp. They had 
codebase=""  and apparently wonted to have ".". Afaik ITW should work around this (oracle plugin 
does :(  )  This patch is handling the "" for codebase as it was "."

The app failed for me in alaca dialogue on NPE, teh patch contains small workaround around possible 
NPE here too + unittest to affected method

ok for head? 1.5?


Accordingly with investigating this failure, I have enhanced 
http://icedtea.classpath.org/wiki/IcedTea-Web#Filing_bugs for offline debugging.

Volunteer for reproducer?-)

Thanx,
J.
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