ssh: prevent exceptions when user associated to stored old key is not found.

rhodecode/apps/ssh_support/lib/backends/__init__.py

@@ -180,6 +180,11 b' class SshWrapper(object):'
 
         elif scm_detected:
             user = User.get(user_id)
+            if not user:
+                log.warning('User with id %s not found', user_id)
+                exit_code = -1
+                return exit_code
+
             auth_user = user.AuthUser()
             permissions = auth_user.permissions['repositories']
 

rhodecode/apps/ssh_support/lib/backends/base.py

@@ -83,8 +83,9 b' class VcsServer(object):'
                     self.user, self.repo_name)
                 return 0
 
-        log.error('Cannot properly fetch or allow user permissions. '
-                  'Return value is: %s, req action: %s', permission, action)
+        log.error('Cannot properly fetch or allow user %s permissions. '
+                  'Return value is: %s, req action: %s',
+                  self.user, permission, action)
         return -2
 
     def update_environment(self, action, extras=None):