[MacPorts] #55492: move: case-only renames fail when no arguments are given

[MacPorts]

#55492: move: case-only renames fail when no arguments are given
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 Reporter:  ryandesign  |      Owner:  ryandesign
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  base        |    Version:  2.4.99
 Keywords:              |       Port:
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 See https://lists.macports.org/pipermail/macports-
 dev/2017-December/036965.html

 In `proc move` we have an `options` variable, but if the caller didn't
 supply any arguments (e.g. didn't supply `-force`, which is the only
 recognized argument), then it's empty. But we still use the empty
 `options` variable when calling `file rename`, which then misinterprets it
 as the name of a file we want to move.

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Ticket URL: <https://trac.macports.org/ticket/55492>
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