Markdown in Python: Footnote ref without a definition raises exception

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Ticket Information

Ticket Title

The footnotes extension does not like it if a footnote is not a matching pair.

This works:
	
    Some text[^Footnote]
    [^Footnote]: Test

This creates an exception:

Some text[^Footnote]

The exception is:

Traceback:
	File "/usr/lib/pymodules/python2.6/markdown/__init__.py" in markdown
	  598.     return md.convert(text)
	File "/usr/lib/pymodules/python2.6/markdown/__init__.py" in convert
	  395.             newRoot = treeprocessor.run(root)
	File "/usr/lib/pymodules/python2.6/markdown/treeprocessors.py" in run
	  271.                                                     text), child)
	File "/usr/lib/pymodules/python2.6/markdown/treeprocessors.py" in __handleInline
	  95.                     data, patternIndex, startIndex)
	File "/usr/lib/pymodules/python2.6/markdown/treeprocessors.py" in __applyPattern
	  219.         node = pattern.handleMatch(match)
	File "/usr/lib/pymodules/python2.6/markdown/extensions/footnotes.py" in handleMatch
	  269.         a.text = str(self.footnotes.footnotes.index(id) + 1)
	File "/usr/lib/pymodules/python2.6/markdown/odict.py" in index
	  120.         return self.keyOrder.index(key)
	
	Exception Type: ValueError at /wiki/forside/brygmetoder/_edit/
	Exception Value: list.index(x): x not in list

This fixes it (in footnotes.py)

def handleMatch(self, m):
	        sup = etree.Element("sup")
	        a = etree.SubElement(sup, "a")
	        id = m.group(2)
	        sup.set('id', self.footnotes.makeFootnoteRefId(id))
	        a.set('href', '#' + self.footnotes.makeFootnoteId(id))
	        a.set('rel', 'footnote')
	        try:
	        	a.text = str(self.footnotes.footnotes.index(id) + 1)
	        	return sup
	        except ValueError:
	                return None

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