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prevent error in IE8 - fixes issue #246
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@ -963,7 +963,7 @@
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ts.getTextValue = function(a, mx, d) {
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if (mx) {
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// make sure the text value is greater than the max numerical value (mx)
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var i, l = a.length, n = mx + d;
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var i, l = a ? a.length : 0, n = mx + d;
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for (i = 0; i < l; i++) {
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n += a.charCodeAt(i);
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}
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