class ApplicationHelper::Button::VmSnapshotAdd < ApplicationHelper::Button::Basic
  def disabled?
    @error_message = if records_and_role_allows? && !@active
                       _('Select the Active snapshot to create a new snapshot for this VM')
                     else
                       @record.unsupported_reason(:snapshot_create)
                     end
    @error_message.present?
  end

  private

  def records_and_role_allows?
    @record.supports_snapshot_create?
  end
end

class ApplicationHelper::Button::VmSnapshotAdd < ApplicationHelper::Button::Basic
  def disabled?
    @error_message = if !role_allows?(:feature => 'vm_snapshot_add')
                       _('Current user lacks permissions to create a new snapshot for this VM')
                     elsif !@record.supports_snapshot_create?
                       @record.unsupported_reason(:snapshot_create)
                     end
    @error_message.present?
  end
end

Allow user to create snapshot without an active snapshot
Allow user to create snapshot without an active snapshot

https://bugzilla.redhat.com/show_bug.cgi?id=1425591
