RFC: fix problems in jforex charts

[Omair Majid]

Hi,

The attached patch fixes a problem with icedtea-web throwing exceptions
when presented with certain javscript results.

The following applet reproduces the problem:
http://www.fxstreet.com/rates-charts/forex-charts/?fxcm=1

The plugin log shows the following:

Consumption (priority=false) completed by consumer thread 0
  PIPE: appletviewer read: context 0 reference 39 JavaScriptCall
Waiting for data...
Found free worker (false) with id 0
Consumer thread 0 woken...
Consumer (priority=false) thread 0 consuming context 0 reference 39
JavaScriptCall
readPair: 'context' - '0' 10
readPair: 'reference' - '39' 23
readPair: 'JavaScriptCall' - 'null' 23
Breakdown -- type: context identifier: 0 reference: 39 src: null
privileges: null rest: "JavaScriptCall "

There is no value after JavaScriptCall, and the Java side fails to
handle such a case and throws an exception.

Okay to commit to HEAD/1.2? (Any others?)

Thanks,
Omair
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