[Bug 2023583] [NEW] gracefully handle format object with fstype: ''

[Dan Bungert]

Public bug reported:

In multiple bug reports originating from ubuntu-desktop-installer,
people are showing an error of the form:

            raise ValueError("unsupported fs type '%s'" % fstype)
        ValueError: unsupported fs type ''
        unsupported fs type ''

For intentional unformatted partitions, this should be accepted.
The installer UI should also enforce appropriate usage of this case - ensure that the partition is formatted when it's supposed to be.

** Affects: curtin
     Importance: Undecided
         Status: New

** Affects: subiquity
     Importance: Undecided
         Status: New

** Affects: ubuntu-desktop-installer
     Importance: Undecided
         Status: New


** Tags: foundations-todo

** Also affects: subiquity
   Importance: Undecided
       Status: New

** Also affects: ubuntu-desktop-installer
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2023583

Title:
  gracefully handle format object with fstype: ''

Status in curtin:
  New
Status in subiquity:
  New
Status in ubuntu-desktop-installer:
  New

Bug description:
  In multiple bug reports originating from ubuntu-desktop-installer,
  people are showing an error of the form:

              raise ValueError("unsupported fs type '%s'" % fstype)
          ValueError: unsupported fs type ''
          unsupported fs type ''

  For intentional unformatted partitions, this should be accepted.
  The installer UI should also enforce appropriate usage of this case - ensure that the partition is formatted when it's supposed to be.

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