ERP5Security: log errors from authentication policy

because PAS only log these errors with level debug (
https://github.com/zopefoundation/Products.PluggableAuthService/blob/0fc22e9c472ba514470a9b205c945eb62df12205/Products/PluggableAuthService/PluggableAuthService.py#L663
) they remained unnoticed in our case

product/ERP5Security/ERP5LoginUserManager.py

@@ -128,14 +128,27 @@ class ERP5LoginUserManager(BasePlugin):
         password,
       ):
         if is_authentication_policy_enabled:
+          try:
             login_value.notifyLoginFailure()
+          except ConflictError:
+            raise
+          except Exception, e:
+            LOG('ERP5Security', PROBLEM,
+                'Error when processing authentication policy', error=sys.exc_info())
         return
     if is_authentication_policy_enabled:
+      try:
         if login_value.isPasswordExpired():
           login_value.notifyPasswordExpire()
           return
         if login_value.isLoginBlocked():
           return
+      except ConflictError:
+        raise
+      except Exception, e:
+        LOG('ERP5Security', PROBLEM,
+            'Error when processing authentication policy', error=sys.exc_info())
+        return None
     return (user_value.getUserId(), login_value.getReference())
 
   def _getLoginValueFromLogin(self, login, login_portal_type=None):

product/ERP5Security/ERP5UserManager.py

@@ -189,6 +189,7 @@ class ERP5UserManager(BasePlugin):
       return None
     user = user_list[0]
 
+    try:
       if authentication_result is None:
         # file a failed authentication attempt
         user.notifyLoginFailure()
@@ -202,6 +203,11 @@ class ERP5UserManager(BasePlugin):
       # check if user account is blocked
       if user.isLoginBlocked():
         return None
+    except ConflictError:
+      raise
+    except Exception, e:
+      LOG('ERP5Security', PROBLEM, 'Error when processing authentication policy', error=sys.exc_info())
+      return None
 
     return authentication_result