Dimension values are separated by extra spaces when other dimension values are empty strings.

[karanpopat]

Describe the bug
Here's an export from steampipe check

{
  "reason": "jenkins not using the default namespace.",
  "resource": "/Users/karanpopat/work/steampipe/kubernetes/steampipe-plugin-kubernetes/k8s-test/tests/kubernetes_service_account/service-account.yaml:33",
  "status": "ok",
  "dimensions": [
    {
      "key": "role_binding_name",
      "value": "jenkins"
    },
    {
      "key": "context_name",
      "value": ""
    },
    {
      "key": "namespace",
      "value": ""
    },
    {
      "key": "source_type",
      "value": "manifest"
    }
  ]
},

where the value for keys context_name and namespace is an empty string "". Due to this, we see spaces in between other values in the terminal view

Steampipe version (steampipe -v)
Example: v0.20.2

Expected behavior

CLI outputs the dimension values, separated by a space.
So, if the dimension values are:

foo
<empty>
bar

The output will be:

foo <empty> bar

Which displays as:

foo bar

It should be:

foo bar