[icedtea-web] RFC: fix exception in debug output from JNLPClassLoader

[Omair Majid]

Hi,

The attached patch fixes an exception that happens when printing debug 
output.

The exception only happens when javaws is run in verbose mode and the 
JVM is shutting down - so it does not affect the behaviour of the JNLP 
application.

Any objections?

ChangeLog
2010-12-24  Omair Majid  <omajid at redhat.com>

     * netx/net/sourceforge/jnlp/runtime/JNLPClassLoader.java
     (installShutdownHooks): Only print when not null.

Cheers,
Omair
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