If enforcedConfigLevel set to `namespace` as shown below,

apiVersion: v1
data:
  global-config: |-
    enforcedConfigLevel: namespace
    ttlSecondsAfterFinished: 60
    historyLimit: 2
    namespaces:
      demo:
        ttlSecondsAfterFinished: 120
        historyLimit: 3
kind: ConfigMap
metadata:
  name: tekton-pruner-default-spec
  namespace: tekton-pipelines

PipelineRuns and TaskRuns created in namespaces other than `demo` namespace as mentioned in this case should inherit the config settings from global. For example a PR created in default namespace should be deleted 60 seconds after completion and all PRs in default namespace should watch for limit of 2 (success and failure each 2)

The bug is that existing logic does not fallthrough to global if namespace specs are not specified, hence the PRs and TRs corresponding to any namespace which do have any explicit setting definition for the namespace are not pruned if the enforced configlevel is namespace.