[refactor] do not print traceback for expected errors

Add the ability to declare an exceptions as 'expected'.
This will avoid logging the backtrace on the bitmaskd log.
We will just forward the message in the json that we return to the
caller.

- Resolves: #8506

1 files changed, 3 insertions, 1 deletions

diff --git a/src/leap/bitmask/bonafide/_srp.py b/src/leap/bitmask/bonafide/_srp.py
index 3f69b33b..3939c5ac 100644
--- a/src/leap/bitmask/bonafide/_srp.py
+++ b/src/leap/bitmask/bonafide/_srp.py
@@ -133,7 +133,9 @@ class SRPSignupMechanism(object):
                     msg = 'username ' + msg[0]
                 else:
                     msg = 'unknown signup error'
-            raise SRPRegistrationError(msg)
+            error = SRPRegistrationError(msg)
+            error.expected = True
+            raise error
         else:
             username = signup.get('login')
             return username