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Some commands are supposed to report a Not Ready Condition (i.e. they require a medium to be present in order to execute successfully). Instead of duplicating the check in each command implementation, let's add a flag and check it before calling the command. This patch only converts existing checks, it does not introduce new checks for any of the other commands that can/should report a Not Ready Condition. Signed-off-by: Kevin Wolf <kwolf@redhat.com>