Clean a bit the code

src/sakia/core/registry/identity.py

@@ -249,7 +249,6 @@ class Identity(QObject):
                         if person_uid == self.uid:
                             return True
         except errors.DuniterError as e:
-            if e.ucode in (errors.NO_MATCHING_IDENTITY,):
             logging.debug("Lookup error : {0}".format(str(e)))
         except NoPeerAvailable as e:
             logging.debug(str(e))
@@ -280,8 +279,6 @@ class Identity(QObject):
         except errors.DuniterError as e:
             if e.ucode in (errors.NO_MATCHING_IDENTITY, errors.NO_MEMBER_MATCHING_PUB_OR_UID):
                 pass
-            else:
-                raise
         except NoPeerAvailable as e:
             logging.debug(str(e))
         return False