XML comments outside root node cause py:else to raise XMLTemplateCompileError

[chrislast]

Adding XML comment using <!-- comment --> outside the root node seems to cause an unnecessary and confusing exception in py:else handling.

d="""
<!-- stuff -->
<a>
  <py:switch test="val">
    <py:case value="1">2</py:case>
    <py:else>1</py:else>
  </py:switch>
</a>
"""
>>> dd=kajiki.XMLTemplate(d)
...
kajiki.xml_template.XMLTemplateCompileError: [<string>:6] py:else directive must be inside a py:switch or directly after py:if without text or spaces in between

Without py:else this works fine:

>>> e="""
<!-- stuff -->
<a>
  <py:switch test="val">
    <py:case value="1">2</py:case>
  </py:switch>
</a>
"""
>>> ee=kajiki.XMLTemplate(e)
>>> print(ee(dict(val=1)).render())
<a>
  2
</a>
>>>

With py:else and without XML comment also works fine

>>> f="""
<a>
 <py:switch test="val">
   <py:case value="1">2</py:case>
   <py:else>1</py:else>
 </py:switch>
</a>"""
>>> ff=kajiki.XMLTemplate(f)
>>> print(ff(dict(val=1)).render())
<a>
   2
</a>
>>> print(ff(dict(val=7)).render())
<a>
   1
</a>