In case storage class parameters are empty, create a new map for Portworx volume labels
In case storage class parameters are empty, create a new map for Portworx volume labels

Fixes #64894

Signed-off-by: Harsh Desai <25a9fc4361f0de99d66f569f23dc0154e7064e35@portworx.com>

kjvalencik/kubernetes,kjvalencik/kubernetes,kjvalencik/kubernetes,kjvalencik/kubernetes,kjvalencik/kubernetes,kjvalencik/kubernetes