Ajax chokes on script triggered onchange if input has onchange=""
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                 Key: MYFACES-2649
                 URL: https://issues.apache.org/jira/browse/MYFACES-2649
             Project: MyFaces Core
          Issue Type: Bug
          Components: JSR-314
    Affects Versions: 2.0.0-beta-3
         Environment: Javascript
            Reporter: Ganesh Jung
         Attachments: MyFaces_Test.war

If an ajaxified input has got onchange="" defined and a script triggers 
input.onchange() we get an error: "event must be defined or null"

example:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml";
      xmlns:f="http://java.sun.com/jsf/core";
      xmlns:h="http://java.sun.com/jsf/html";
      xmlns:ui="http://java.sun.com/jsf/facelets";>
        <h:head></h:head>
        <h:body>
                <h:form id="myForm">
                        <h:inputText id="myTest1" value="#{myBean.test}" 
onchange="">
                                <f:ajax render="myTest2" />
                        </h:inputText>
                        <h:inputText value="#{myBean.test}" id="myTest2" />
                        <script type="text/javascript">
                                //<![CDATA[
                                        
document.getElementById("myForm:myTest1").onchange();
                                //]]>
                        </script>
                </h:form>
        </h:body>
</html>

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