enabling tenant produces "RuntimeError: Working outside of request context."

[spike83]

I tried to enable the TENANT_HEADER or the TENANT_URL_RE using the docker image sourcepole/qwc-map-viewer-demo:v2022.07.13.

Once one of the env variables is set I start getting the following errors.

mounting server:app on /
WSGI app 0 (mountpoint='/') ready in 1 seconds on interpreter 0x7fd4a4d69c20 pid: 1 (default app)
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI master process (pid: 1)
spawned uWSGI worker 1 (pid: 7, cores: 4)
Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/flask/app.py", line 2091, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/lib/python3.9/site-packages/qwc_services_core/tenant_handler.py", line 133, in __call__
    tenant = self.tenant_handler.tenant()
  File "/usr/lib/python3.9/site-packages/qwc_services_core/tenant_handler.py", line 31, in tenant
    return request.headers.get(self.tenant_header, DEFAULT_TENANT)
  File "/usr/lib/python3.9/site-packages/werkzeug/local.py", line 432, in __get__
    obj = instance._get_current_object()
  File "/usr/lib/python3.9/site-packages/werkzeug/local.py", line 554, in _get_current_object
    return self.__local()  # type: ignore
  File "/usr/lib/python3.9/site-packages/flask/globals.py", line 33, in _lookup_req_object
    raise RuntimeError(_request_ctx_err_msg)
RuntimeError: Working outside of request context.

This typically means that you attempted to use functionality that needed
an active HTTP request.  Consult the documentation on testing for
information about how to avoid this problem.

[manisandro]

I believe this is ince fixed, please reopen if it still applies.