MarkupComponentBorder skips first tag in MarkupStream
-----------------------------------------------------

                 Key: WICKET-1829
                 URL: https://issues.apache.org/jira/browse/WICKET-1829
             Project: Wicket
          Issue Type: Bug
          Components: wicket
    Affects Versions: 1.3.4
            Reporter: Scott MacKenzie
            Priority: Minor


If there is no leading markup in a MarkupComponentBorder before the 
<wicket:border/> tag, the following error will occur:

Unexpected tag encountered in markup of component border 
com.cucbc.wicket.component.input.MDFieldBorder. Tag: <wicket:body/>, expected 
tag: <wicket:border>

Steps to reproduce:
Create a ComponentBorder with no leading markup before <wicket:border/>:

TestComponentBorder.html
--------------------------------------
<wicket:border>
        <div class="input">
                <wicket:body/>
        </div>
</wicket:border>

TestComponentBorder.java
--------------------------------------
public class MDFieldBorder extends MarkupComponentBorder
{
}

This happens because the rendering loop calls stream.next(); when it starts, 
always skipping the first element.  It should call stream.get() before the 
loop, then stream.next() at the end.


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