Do not trust specified encoding

This patch will always perform conversion against given encoding, in order to check if this codec is valid or not.

product/ERP5/Document/TextDocument.py

@@ -333,7 +333,6 @@ class TextDocument(CachedConvertableMixin, BaseConvertableFileMixin,
         message = 'Conversion to base format succeeds'
         if re_match is not None:
           charset = re_match.group('charset')
-          if charset.lower() != 'utf-8':
           try:
             # Use encoding in html document
             text_content = text_content.decode(charset).encode('utf-8')
@@ -344,6 +343,7 @@ class TextDocument(CachedConvertableMixin, BaseConvertableFileMixin,
           else:
             message = 'Conversion to base format with charset %r succeeds'\
                                                                     % charset
+            if charset.lower() != 'utf-8':
               charset = 'utf-8' # Override charset if convertion succeeds
               # change charset value in html_document as well
               def subCharset(matchobj):

product/ERP5OOo/tests/testDms.py

@@ -1704,6 +1704,11 @@ document.write('<sc'+'ript type="text/javascript" src="http://somosite.bg/utb.ph
     self.assertTrue('AZERTYY' not in safe_html)
     self.assertTrue('#FFAA44' in safe_html)
 
+    filename = 'broken_html.html'
+    file_object = makeFileUpload(filename)
+    web_page.edit(file=file_object)
+    converted = web_page.convert('html')[1]
+
   def test_safeHTML_impossible_conversion(self):
     """Some html are not parsable.
     """