Excluded elements in fields sometimes won't bootsrap

[paxtonhare]

When defining a field with excluded elements in ml-config.xml you might be tempted to leave out unused options:

              <field-name>stuff</field-name>
              <include-root>true</include-root>
              <included-elements></included-elements>
              <excluded-elements>
                  <excluded-element>
                      <namespace-uri>http://www.namespace.com</namespace-uri>
                      <localname>things</localname>
                  </excluded-element>
              </excluded-elements>
          </field>

Left out of the above xml are:

                      <attribute-namespace-uri/>
                      <attribute-localname/>
                      <attribute-value/>

The roxy code to create an excluded element passes these to the function as () but the admin api really wants "".

[paxtonhare]

fixed