Don't include } in DOI at the end if no { (#1180)

This fixes #1161.

DOI.js

@@ -9,7 +9,7 @@
 	"inRepository": true,
 	"translatorType": 4,
 	"browserSupport": "gcsv",
-	"lastUpdated": "2016-10-31 02:54:35"
+	"lastUpdated": "2016-11-05 10:57:01"
 }
 
 // The variables items and selectArray will be filled during the first
@@ -49,6 +49,9 @@ function getDOIs(doc) {
 			if(DOI.substr(-1) == ")" && DOI.indexOf("(") == -1) {
 				DOI = DOI.substr(0, DOI.length-1);
 			}
+			if(DOI.substr(-1) == "}" && DOI.indexOf("{") == -1) {
+				DOI = DOI.substr(0, DOI.length-1);
+			}
 			// only add new DOIs
 			if(dois.indexOf(DOI) == -1) {
 				dois.push(DOI);
@@ -178,6 +181,16 @@ var testCases = [
 		"type": "web",
 		"url": "http://www.egms.de/static/de/journals/mbi/2015-15/mbi000336.shtml",
 		"items": "multiple"
+	},
+	{
+		"type": "web",
+		"url": "http://www.roboticsproceedings.org/rss09/p23.html",
+		"items": "multiple"
+	},
+	{
+		"type": "web",
+		"url": "https://en.wikipedia.org/wiki/Template_talk:Doi",
+		"items": "multiple"
 	}
 ]
 /** END TEST CASES **/