Log warning / avoid error if email profile can't be normalized

e.g. if some import error happens

tailbone/views/email.py

@@ -24,6 +24,7 @@
 Email Views
 """
 
+import logging
 import re
 import warnings
 
@@ -41,6 +42,9 @@ from tailbone.db import Session
 from tailbone.views import View, MasterView
 
 
+log = logging.getLogger(__name__)
+
+
 class EmailSettingView(MasterView):
     """
     Master view for email admin (settings/preview).
@@ -103,7 +107,13 @@ class EmailSettingView(MasterView):
             emails = self.email_handler.get_available_emails()
         for key, Email in emails.items():
             email = Email(self.rattail_config, key)
-            data.append(self.normalize(email))
+            try:
+                normalized = self.normalize(email)
+            except:
+                log.warning("cannot normalize email: %s", email,
+                            exc_info=True)
+            else:
+                data.append(normalized)
         return data
 
     def configure_grid(self, g):