Fix exception on a link containing a newline

Author: adam-earthscope

tests/test_urls.py

@@ -50,6 +50,10 @@ def test_urls():
     expect = '\t<p><a href="/test/">A link that starts with a space&#8221; raises</a> an exception.</p>'
     assert result == expect
 
+    result = t.parse('A link that "contains a\nnewline":/test/ raises an exception.')
+    expect = '\t<p>A link that <a href="/test/">contains a\nnewline</a> raises an exception.</p>'
+    assert result == expect
+
 def test_rel_attribute():
     t = Textile(rel='nofollow')
     result = t.parse('"$":http://domain.tld')

textile/core.py

@@ -759,9 +759,9 @@ def fLink(self, m):
             $'''.format(cls_re_s, regex_snippets['space']), inner,
                 flags=re.X | re.U)
 
-        atts = m.group('atts') or ''
-        text = m.group('text') or '' or inner
-        title = m.group('title') or ''
+        atts = (m and m.group('atts')) or ''
+        text = (m and m.group('text')) or inner
+        title = (m and m.group('title')) or ''
 
         pop, tight = '', ''
         counts = { '[': None, ']': url.count(']'), '(': None, ')': None }