Changed parse() method to use option.text() instead of option.html()

The parse() method gets the value of the combobox's text field from the selected option using option.html(). When the value contains html characters, the value is "double-escaped" in the text field (e.g. "<" is displayed as "&lt;"). To avoid this, the option's value should be parsed using option.text() and not option.html(), assuming that the <option> tags do not have inner HTML elements.