Fix 'title is null' error
Not sure why item.title would ever be null, but this was in a user's error report and seemed to be causing a restart error.
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@ -1455,7 +1455,7 @@ Zotero.Items = function() {
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this.getSortTitle = function(title) {
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if (title === false || title === undefined) {
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if (title === false || title === undefined || title == null) {
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return '';
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}
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if (typeof title == 'number') {
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