ThreatMapper Email User Invite not working

Describe the bug When I invite a user via email, this feature is not working.

To Reproduce Steps to reproduce the behavior:

Go to User Management
Click on Send Invite
Fill in email
Click Send sign up request

Expected behavior It shows "Invite sent" but no email has been received.

Screenshots

Components/Services affected

[ ] API/Backend

Additional context

Log file of this:
`      #Traceback (most recent call last):
      U  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2077, in wsgi_app
      ,    response = self.full_dispatch_request()
      b  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1525, in full_dispatch_request
      '    rv = self.handle_user_exception(e)
      e  File "/usr/local/lib/python3.9/site-packages/flask_restful/__init__.py", line 271, in error_router
          return original_handler(e)
      e  File "/usr/local/lib/python3.9/site-packages/flask_restful/__init__.py", line 271, in error_router
          return original_handler(e)
      g  File "/usr/local/lib/python3.9/site-packages/flask_cors/extension.py", line 165, in wrapped_function
      E    return cors_after_request(app.make_response(f(*args, **kwargs)))
      b  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1523, in full_dispatch_request
      !    rv = self.dispatch_request()
      ]  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1509, in dispatch_request
      Q    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
      n  File "/usr/local/lib/python3.9/site-packages/flask_jwt_extended/view_decorators.py", line 154, in decorator
      8    return current_app.ensure_sync(fn)(*args, **kwargs)
      A  File "/app/code/utils/decorators.py", line 30, in func_wrapper
      !    return func(*args, **kwargs)
      =  File "/app/code/api/user_api.py", line 602, in user_delete
          user.delete()
      6  File "/app/code/models/user.py", line 87, in delete
          db.session.commit()
      %  File "<string>", line 2, in commit
      `  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 1435, in commit
      3    self._transaction.commit(_to_root=self.future)
      _  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 829, in commit
          self._prepare_impl()
      f  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 808, in _prepare_impl
          self.session.flush()
      _  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 3367, in flush
          self._flush(objects)
      `  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 3507, in _flush
      2    transaction.rollback(_capture_exception=True)
      e  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/util/langhelpers.py", line 70, in __exit__
          compat.raise_(
      _  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/util/compat.py", line 207, in raise_
          raise exception
      `  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/orm/session.py", line 3467, in _flush
          flush_context.execute()
      c  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/orm/unitofwork.py", line 456, in execute
          rec.execute(self)
      c  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/orm/unitofwork.py", line 630, in execute
      -    util.preloaded.orm_persistence.save_obj(
      e  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/orm/persistence.py", line 237, in save_obj
          _emit_update_statements(
      u  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/orm/persistence.py", line 1001, in _emit_update_statements
           c = connection._execute_20(
      e  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1631, in _execute_20
      G    return meth(self, args_10style, kwargs_10style, execution_options)
      p  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/sql/elements.py", line 325, in _execute_on_connection
      .    return connection._execute_clauseelement(
      p  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1498, in _execute_clauseelement
      !    ret = self._execute_context(
      j  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1862, in _execute_context
      "    self._handle_dbapi_exception(
      q  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 2043, in _handle_dbapi_exception
          util.raise_(
      _  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/util/compat.py", line 207, in raise_
          raise exception
      j  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 1819, in _execute_context
          self.dialect.do_execute(
      f  File "/usr/local/lib/python3.9/site-packages/sqlalchemy/engine/default.py", line 732, in do_execute
      *    cursor.execute(statement, parameters)
      “sqlalchemy.exc.IntegrityError: (psycopg2.errors.NotNullViolation) null value in column "user_id" of relation "invite" violates not-null constraint
      ±DETAIL:  Failing row contains (1, [email protected], 8e62d44ba153c5824aa73acbc9335768, null, 1, 1, t, 2022-08-23 07:43:27.472741+00, 2022-12-29 10:18:45.733978+00).
      
      _[SQL: UPDATE invite SET user_id=%(user_id)s, updated_at=now() WHERE invite.id = %(invite_id)s]
      0[parameters: {'user_id': None, 'invite_id': 1}]
      =(Background on this error at: https://sqlalche.me/e/14/gkpj)