Better text rendering

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2515 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Telephone.py

@@ -132,9 +132,15 @@ Mobile Phone, Fax, Remote Access, etc.)."""
         """
           Returns the telephone number in standard format
         """
-        text = "+%s(0)%s-%s" % (self.telephone_country
-                              , self.telephone_area
-                              , self.telephone_number)
+	text = '+'
+	if self.telephone_country != None:
+          text += self.telephone_country
+	text += '(0)'
+	if self.telephone_area != None:
+	  text += self.telephone_area
+	text += '-'
+	if self.telephone_number != None:
+	  text += self.telephone_number
         if text == '+(0)-' :
           return ''
         else: