Describe the bug
When adding the a custom table to the .spc file, the servicenow schema does not load during a .inspect, nor queries run. The custom table seems to break the schema entirely.

Steampipe version (steampipe -v)
Steampipe v0.24.2

Plugin version (steampipe plugin list)
ServiceNow Plugin v0.3.1

To reproduce

1. Run .inspect servicenow and see your tables load.
2. Run a query on a servicenow table to see your queries work.
3. Then add a custom table in the .spc, a known one in the documentation like "cmdb_model". Try running .inspect servicenow -- no tables will show. Try a query on any servicenow table -- no query will run.
4. Remove the custom table in the .spc, then try running .inspect servicenow again and then a query -- things should be back to normal