radiofrance: Fix crash when there is no author

Triggered by FIP at night.
Also force unicode when merging titles.

modules/radiofrance/backend.py

@@ -161,7 +161,7 @@ class RadioFranceBackend(BaseBackend, ICapRadio, ICapCollection, ICapVideo):
                     artist = dartist
                 if dtitle:
                     if title:
-                        title = "%s [%s]" % (dtitle, title)
+                        title = u"%s [%s]" % (dtitle, title)
                     else:
                         title = dtitle
             elif radio.id in self._LARGEDIRECTJSON_RADIOS:

modules/radiofrance/browser.py

@@ -102,6 +102,8 @@ class DataPage(BasePage):
             artist = unicode(artist).strip()
             ftitle = document.findtext('//div[@class="subtitle"]')
             title = unicode(ftitle).strip() if ftitle else title
+        else:
+            artist = None
 
         return (artist, title)