request_interactive_review() should not die with stragen unicode chars.

simple workaround.

osc/core.py

@@ -4919,7 +4919,15 @@ def request_interactive_review(apiurl, request):
     import tempfile, subprocess, re
 
     tmpfile = None
+
+    try:
+      # FIXME: print can fail with unicode chars in the string. 
+      #        Here we fix the symptoms, not the cause.
+      # UnicodeEncodeError: 'ascii' codec can't encode character u'\u2002' in position 309: ordinal not in range(128)
       print request
+    except:
+      print request.__str__().encode('ascii', 'xmlcharrefreplace')
+
     try:
         msg = '(a)ccept/(d)ecline/(r)evoke/(c)ancel > '
         if request.actions[0].type == 'submit':