[FIX] crm: Declare the signature variable

bzr revid: stephane@openerp.com-20100511165416-vmilmnn9zws8dxrd

addons/crm/wizard/crm_send_email.py

@@ -223,6 +223,7 @@ class crm_send_new_email(osv.osv_memory):
                 sentdate = 'Date: %s' % (hist.date)
                 desc = '\n%s'%(hist.description)
 
+                signature = ''
                 if case.user_id.signature:
                     signature = '--\n' + case.user_id.signature