[rfc][icedtea-web] exception flaw in usages of PluginDebug.debug(...)

[Jiri Vanek]

Hi! Today Jana during testing of js api of IcedTEa-Web have encountered exception which was caused 
by PluginDebug.Debug. Even when DEBUG was disabled, then it caused NPE or ArrayOutOfBounds exceptions

eg PluginDebug.debug(object.something()) when object was null, then icedtea-web have fail even when 
debug was off.

This patch is fixing it.

Not all occurrences of PluginDebug.debug() were "fixed",  but just those affected by issue.

I have also fortified debug() method itself a bit.

Tahanx for comments

J.
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