[FIX] if not lang in get_source method on transaltion then return blank

bzr revid: mra@tinyerp.com-20100215125014-duvoo2ppwup959xn

bin/addons/base/ir/ir_translation.py

@@ -123,6 +123,8 @@ class ir_translation(osv.osv):
 
     @tools.cache(skiparg=3)
     def _get_source(self, cr, uid, name, tt, lang, source=None):
+        if not lang:
+            return ''
         if source:
             #if isinstance(source, unicode):
             #   source = source.encode('utf8')