Automatic merge from submit-queue (batch tested with PRs 49212, 49203, 49255)

If the init fails for whatever reason, plugin is nil and cannot be used.

**What this PR does / why we need it**:

Addressing
```
=== RUN   TestCanSupport
E0719 13:48:19.829849    2289 driver-call.go:232] init command failed, status: Successx, reason:
--- FAIL: TestCanSupport (0.00s)
	flexvolume_test.go:180: Can't find the plugin by name
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x30 pc=0x11fc5b5]
```

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

N/A

**Special notes for your reviewer**:

N/A

**Release note**:

```release-note
NONE
```