[MERGE] tools.html2plaintext: consistent use of lxml.etree.HTMLParser to convert HTML to plaintext

We used to switch to using BeautifulSoup when available, but that
lead to inconsistent behavior depending on the installed Python
packages, and sometimes to bad surprises. There is no advantage
in using BeautifulSoup rather than HTMLParser, and the latter is
always available, as we depend on lxml.

bzr revid: odo@openerp.com-20121015130828-nd7tj9fa4sh8av3k

openerp/tools/misc.py

@@ -312,16 +312,8 @@ def html2plaintext(html, body_id=None, encoding='utf-8'):
 
     html = ustr(html)
 
-    from lxml.etree import tostring
-    try:
-        from lxml.html.soupparser import fromstring
-        kwargs = {}
-    except ImportError:
-        _logger.debug('tools.misc.html2plaintext: cannot use BeautifulSoup, fallback to lxml.etree.HTMLParser')
-        from lxml.etree import fromstring, HTMLParser
-        kwargs = dict(parser=HTMLParser())
-
-    tree = fromstring(html, **kwargs)
+    from lxml.etree import tostring, fromstring, HTMLParser
+    tree = fromstring(html, parser=HTMLParser())
 
     if body_id is not None:
         source = tree.xpath('//*[@id=%s]'%(body_id,))