Issue with Schema Generation w/ Multi-Tenancy Configuration

**Describe the bug**
We are experiencing an issue in the Cube data model generation with our multi-tenancy configuration. We are able to query the API successfully and run queries within the Playground successfully. However when we attempt to generate new Cube configuration files via the "Tables" feature in the "Data Model" tab, we receive the following error in the UI:

```python
Error while loading DB schema
Error: Python error: TypeError: 'NoneType' object is not subscriptable Traceback (most recent call last): File "cube.py", line 26, in driver_factory "database": ctx["securityContext"]["tenant_db"],
```
We are connecting to Snowflake and querying different databases depending on the security context provided.

Our hunch is that the security context we've provided in the "Playground" page is not carrying over to the request made in the "Data Model" tab. We've found that if we remove our `driver_factory` config and supply a `CUBEJS_DB_NAME` environment variable we no longer experience this issue.

Here is our `cube.py` for reference:

```python
from tenants import create_security_context

from cube import config

@config("context_to_app_id")
def context_to_app_id(ctx: dict) -> dict:
return (
f"{ctx['securityContext']['tenant_db']}_{ctx['securityContext']['environment']}"
)

@config("context_to_orchestrator_id")
def context_to_orchestrator_id(ctx: dict) -> str:
return (
f"{ctx['securityContext']['tenant_db']}_{ctx['securityContext']['environment']}"
)

@config("driver_factory")
def driver_factory(ctx: dict) -> None:
return {
"type": "snowflake",
"database": ctx["securityContext"]["tenant_db"],
}

@config("pre_aggregations_schema")
def pre_aggregations_schema(ctx: dict) -> str:
return f"pre_aggregations_{ctx['securityContext']['tenant_db']}_{ctx['securityContext']['environment']}"

@config("scheduled_refresh_contexts")
def scheduled_refresh_contexts() -> list[object]:
return create_security_context()

```

**To Reproduce**
Steps to reproduce the behavior:
1) Go to Playground (http://localhost:4000)
2) Enter security context (queries run successfully)
3) Go to "Data Model" page
4) Click "Tables"

**Expected behavior**
Cube should be able to generate the database object information and we should be able to select the tables and automatically generate Cube YAML.

**Screenshots**

**Minimally reproducible Cube Schema**
In case your bug report is data modelling related please put your minimally reproducible Cube Schema here.
You can use selects without tables in order to achieve that as follows.

```yaml
cubes:
- name: table_one
sql_table: "\"DBT_{COMPILE_CONTEXT.securityContext.tenant_db}\".\"TABLE_ONE\""
data_source: default

joins:
- name: other_table
relationship: one_to_one
sql: "{CUBE.user_id} = {other_table.user_id}"

dimensions:
- name: user_id
sql: "{CUBE}.\"USER_ID\""
type: string

measures:
- name: count
type: count

pre_aggregations:

```

**Version:**
CUBE_VERSION=0.35

**Additional context**
Add any other context about the problem here.