csi-resizer logs a warning every time a new PVC is created

[takuhiro]

csi-resizer came to output the following warning message every time a new PVC is created from v1.2.0.

I0816 07:50:11.380497       1 controller.go:291] Started PVC processing "default/sample-volume-jtdql"
W0816 07:50:11.380594       1 controller.go:318] PV "" bound to PVC default/sample-volume-jtdql not found

Until v1.1.0, it had output the following info-level message when a new PVC is created.

I0816 07:24:52.092956       1 controller.go:281] Started PVC processing "default/sample-volume-fffx6"
I0816 07:24:52.092986       1 controller.go:304] No need to resize PVC "default/sample-volume-fffx6"

This is the side effect of this commit.
The case had been handled by this block until v1.1.0, but it is handled by here since v1.2.0.

I think the log level should be changed to info, or the empty check of pvc.Spec.VolumeName should be added before here.

[humblec]

@takuhiro agree on the possibilities or analysis, would you like to send a PR for addressing the same?

[takuhiro]

@humblec Thank you for answering. Yes, I will send a PR.