Running `cdk deploy` with no parameters on the synthesized stack fails with unset parameter `tfsecExcludeList`

I think that there should be a default value set for `tfsecExcludeList`. When I tried to `cdk deploy` the stack without specifying any parameeters, the deploy failed.

I had to specify:
`cdk deploy --parameters tfsecExcludeList=''`

In order for the stack to begin a deployment.

I think the update needs to be here: `main/lib/scsp-pipeline-stack.ts#L1060-1062` .

Inspect main/lib/scsp-pipeline-stack.ts at lines 1060-1062, where the tfsecExcludeList parameter is defined. First reproduce the failure with cdk deploy and no parameters, then verify that deployment starts without explicitly passing tfsecExcludeList; the existing workaround is cdk deploy --parameters tfsecExcludeList=''.

Written by the indexing model from the issue text.