Using @param annotation with body causes redoc rendering to fail

Describe the bug
rodoc fails with error:

Something went wrong...
n.slice is not a function or its return value is not iterable
Stack trace
TypeError: n.slice is not a function or its return value is not iterable
    at get codeSamples (http://127.0.0.1:8001/docs:57:87280)
    at Tu.get (http://127.0.0.1:8001/docs:57:9924)
    at Vb.render (http://127.0.0.1:8001/docs:1688:133)
    at http://127.0.0.1:8001/docs:1108:5907
    at http://127.0.0.1:8001/docs:1108:5926
    at Je (http://127.0.0.1:8001/docs:18:571444)
    at t.track (http://127.0.0.1:8001/docs:18:575944)
    at Vb.<anonymous> (http://127.0.0.1:8001/docs:1108:5846)
    at t.render (http://127.0.0.1:8001/docs:1108:7803)
    at js (http://127.0.0.1:8001/docs:18:404628)

ReDoc Version: 2.1.5
Commit: 3658b6d

Minimal reproducible OpenAPI snippet(if possible)

{
    "description": "body",
     "name": "request",
     "in": "body",
      "required": true,
      "schema": {
           "type": "string"
       }
},

Start by reproducing the failure in ReDoc 2.1.5 with the minimal OpenAPI parameter object shown in the issue, using the reported code-samples rendering error as the entry point. The work is done when an operation with an @param annotation and a body parameter renders without the n.slice error.