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Sub-task
 - 
    Resolution: Invalid
 - 
    
P2: Important
 - 
    None
 - 
    None
 
Autotests: tst_QScriptContext::throwError_fromEvaluate(ErrorAndReturnString), tst_QScriptContext::throwError_fromCpp(ErrorAndReturnString)
A native function throws an error, but when we convert the error to a 
string it's not correct.