Verify that contentType exists #4051

@@ -129,7 +129,8 @@ public class DirectControlServlet extends HttpServlet {
                 }
             } else {
                 // Check if the request is a backbone style "emulateJSON" request
-                if (request.getContentType().indexOf("x-www-form-urlencoded") != -1 &&
+                if (request.getContentType() != null && 
+			request.getContentType().indexOf("x-www-form-urlencoded") != -1 &&
 			request.getParameter("model") != null) {
                     Debug.logInfo("MODEL: " + request.getParameter("model"), module);
                     JSON json = new JSON(new StringReader(request.getParameter("model")));