[2140627] Not able to select storageClass if there is no default storageclass defined

Description of problem:
Not able to select storageClass if there is no default storageclass defined

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. set the annotation storageclass.kubernetes.io/is-default-class to false for all storage class
2. on vm add disk modal, not able to select storageclass
3.

Actual results:

Expected results:

Additional info: