The Lingua extractor must not generate a parse error in case of extra blank...

The Lingua extractor must not generate a parse error in case of extra blank spaces inside curly brackets.

mako/ext/linguaplugin.py

@@ -31,7 +31,7 @@ class LinguaMakoExtractor(Extractor, MessageExtractor):
             elif source.startswith(compat.b('elif')):
                 source = source[2:] # Replace "elif" with "if"
             source += compat.b('pass')
-            code = io.BytesIO(source)
+        code = io.BytesIO(source)
         for msg in self.python_extractor(
                 self.filename, self.options, code, code_lineno -1):
             if translator_strings:

test/templates/gettext.mako

@@ -125,3 +125,6 @@ ${_(u'bar')}
 % except:
 <p>Failed!</p>
 % endtry
+
+## TRANSLATOR: this should not cause a parse error
+${ 1 }