Function 'patchPropertiesCorrespondToPutProperties' threw an exception: Cannot read property 'length' of undefined

**Describe the bug**

I discovered the following errors in the logs of `~[NotRequired_Staging] Swagger LintDiff failed` for a PR for my RP:

```
- FATAL
spectralPluginFunc: Failed validating: 'file:///mnt/vss/_work/1/azure-rest-api-specs-pr/specification/throttling/resource-manager/Microsoft.Throttling/preview/2022-06-01-preview/throttling.json'. Errors encountered:
Error: Error running Nimma
Error 1: $[paths,'x-ms-paths'].* threw: ErrorWithCause("Function \"patchPropertiesCorrespondToPutProperties\" threw an exception: Cannot read property 'length' of undefined")
Error 2: $[paths,'x-ms-paths'].* threw: ErrorWithCause("Function \"patchPropertiesCorrespondToPutProperties\" threw an exception: Cannot read property 'length' of undefined")
Error 3: $[paths,'x-ms-paths'].* threw: ErrorWithCause("Function \"patchPropertiesCorrespondToPutProperties\" threw an exception: Cannot read property 'length' of undefined")
Error 4: $[paths,'x-ms-paths'].* threw: ErrorWithCause("Function \"patchPropertiesCorrespondToPutProperties\" threw an exception: Cannot read property 'length' of undefined")
Error 5: $[paths,'x-ms-paths'].* threw: ErrorWithCause("Function \"patchPropertiesCorrespondToPutProperties\" threw an exception: Cannot read property 'length' of undefined")
Error 6: $[paths,'x-ms-paths'].* threw: ErrorWithCause("Function \"patchPropertiesCorrespondToPutProperties\" threw an exception: Cannot read property 'length' of undefined")
Error 7: $[paths,'x-ms-paths'].* threw: ErrorWithCause("Function \"patchPropertiesCorrespondToPutProperties\" threw an exception: Cannot read property 'length' of undefined")
```

See https://dev.azure.com/azure-sdk/internal/_build/results?buildId=3154242&view=logs&j=688669d0-441c-57c3-cf6d-f89a22ccfa5d&t=b91b1e88-b042-5e18-36d8-34e4fb3a9b3b&l=619

**To Reproduce**

N/A

**Expected behavior**

The function should handle incorrect input gracefully.

**Screenshots**

N/A

**Desktop (please complete the following information):**

N/A

**Additional context**

N/A