Don't use document.defaultView as a security principal if it is null
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@ -1428,7 +1428,7 @@ Zotero.Translate.Web.prototype._getTranslatorsGetPotentialTranslators = function
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Zotero.Translate.Web.prototype._getSandboxLocation = function() {
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if(this._parentTranslator) {
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return this._parentTranslator._sandboxLocation;
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} else if("defaultView" in this.document) {
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} else if(this.document.defaultView) {
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return this.document.defaultView;
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} else {
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return this.document.location.toString();
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