Fix exception on ###.. block

Author: adam-earthscope

tests/test_block.py

@@ -62,3 +62,10 @@ def test_blockcode_in_README():
     with open('tests/fixtures/README.txt') as f:
         expect = ''.join(f.readlines())
     assert result == expect
+
+def test_blockcode_comment():
+    input = '###.. block comment\nanother line\n\np. New line'
+    expect = '\t<p>New line</p>'
+    t = textile.Textile()
+    result = t.parse(input)
+    assert result == expect

textile/core.py

@@ -465,7 +465,7 @@ def block(self, text):
             else:
                 # if we're inside an extended block, add the text from the
                 # previous extension to the front
-                if ext:
+                if ext and out:
                     line = '{0}\n\n{1}'.format(out.pop(), line)
                 whitespace = ' \t\n\r\f\v'
                 if ext or not line[0] in whitespace:
@@ -494,7 +494,7 @@ def block(self, text):
                 cite = ''
                 graf = ''
 
-        if ext:
+        if ext and out:
             out.append(generate_tag(block.outer_tag, out.pop(),
                 block.outer_atts))
         return '\n\n'.join(out)