Merge pull request #536 from adam3smith/coinsfix

test for presence of author's firstName before using it

chrome/content/zotero/xpcom/openurl.js

@@ -483,6 +483,7 @@ Zotero.OpenURL = new function() {
 			    // same last name, and the same first name up to a point), keep
 			    // the plain author, since it might have a middle initial
 			    if (item.creators[j].lastName == complexAu[i].lastName &&
+			        item.creators[j].firstName &&
 			        (item.creators[j].firstName == complexAu[i].firstName == "" ||
 			            (item.creators[j].firstName.length >= complexAu[i].firstName.length &&
 			                item.creators[j].firstName.substr(0, complexAu[i].firstName.length) == complexAu[i].firstName))) {