[VDI] VM Update Failed, The ISO Does Not Exist
Issue Description
VM add NIC. Error message appears: "Update failed. The ISO file does not exist."

Handling Process
- Edit VM and found that the ISO does not exist in virtual storage anymore.
Root Cause
The VM was loaded with ISO image file, the ISO no longer exists in the virtual storage.
Solution
Set the CD/DVD drive mode to None, then re-add the NIC.
