Fix possible browser freeze #1573
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Fix possible browser freeze
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cptable.utils.decodewill throw a Runtime Error instead of returning an error message string, soerrshould be changed toerr.message.Without the fix, whenever it fails to decode using given character encoding, the whole window freezes. For example, input a Chinese character 你 in UTF-8 and change output encoding to GB18030 will 100% freeze the browser.