Check for undefined rather than false when deciding which attributes to allow for \mmlToken. Resolves issue #913.
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@ -1476,7 +1476,7 @@
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match = attr.match(/^([a-z]+)\s*=\s*(\'[^']*'|"[^"]*"|[^ ]*)\s*/i);
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if (!match)
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{TEX.Error(["InvalidMathMLAttr","Invalid MathML attribute: %1",attr])}
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if (!MML[type].prototype.defaults[match[1]] && !this.MmlTokenAllow[match[1]]) {
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if (MML[type].prototype.defaults[match[1]] == null && !this.MmlTokenAllow[match[1]]) {
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TEX.Error(["UnknownAttrForElement",
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"%1 is not a recognized attribute for %2",
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match[1],type]);
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