pub list command failing with an exception

[DartBot]

This issue was originally filed by petr...@gmail.com

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What steps will reproduce the problem?

1. Run pub list command

What is the expected output? What do you see instead?
I would except to see the contents of repositories listed or at least an error message, instead I'm getting this:

NoSuchMethodException : method not found: 'listDir'
Receiver: Instance of 'SystemCache'
Arguments: [null]
Unhandled exception:
NullPointerException : method: 'handleException'
Receiver: null
Arguments: [Closure: <T>(Dynamic) => Dynamic]
 0. Function: 'Object.noSuchMethod' url: 'bootstrap' line:473 col:137
 1. Function: 'FutureImpl.function' url: 'bootstrap_impl' line:565 col:350
 2. Function: 'FutureImpl._complete@924b4b8' url: 'bootstrap_impl' line:556 col:3
 3. Function: 'FutureImpl._setValue@924b4b8' url: 'bootstrap_impl' line:559 col:22
 4. Function: 'CompleterImpl.complete' url: 'bootstrap_impl' line:571 col:46
 5. Function: 'FutureImpl.function' url: 'bootstrap_impl' line:563 col:114
 6. Function: 'FutureImpl._complete@924b4b8' url: 'bootstrap_impl' line:556 col:3
 7. Function: 'FutureImpl._setValue@924b4b8' url: 'bootstrap_impl' line:559 col:22
 8. Function: 'CompleterImpl.complete' url: 'bootstrap_impl' line:571 col:46
 9. Function: 'FutureImpl.function' url: 'bootstrap_impl' line:567 col:61
 10. Function: 'FutureImpl.then' url: 'bootstrap_impl' line:549 col:182
 11. Function: 'FutureImpl.function' url: 'bootstrap_impl' line:566 col:82
 12. Function: 'FutureImpl._complete@924b4b8' url: 'bootstrap_impl' line:556 col:3
 13. Function: 'FutureImpl._setValue@924b4b8' url: 'bootstrap_impl' line:559 col:22
 14. Function: 'CompleterImpl.complete' url: 'bootstrap_impl' line:571 col:46
 15. Function: 'FutureImpl.function' url: 'bootstrap_impl' line:563 col:114
 16. Function: 'FutureImpl._complete@924b4b8' url: 'bootstrap_impl' line:556 col:3
 17. Function: 'FutureImpl._setValue@924b4b8' url: 'bootstrap_impl' line:559 col:22
 18. Function: 'CompleterImpl.complete' url: 'bootstrap_impl' line:571 col:46
 19. Function: '_SendPortImpl@6be832b.function' url: 'dart:isolate' line:22 col:346
 20. Function: '_ReceivePortImpl@6be832b._handleMessage@6be832b' url: 'dart:isolate' line:19 col:46

What version of the product are you using? On what operating system?
Dart build 8124, Mac OS X 10.7.4

Please provide any additional information below.
There is not much documentation available on pub usage, but still I would at least except an error message when being used incorrectly, not an exception.

[madsager]

Added Area-Pub, Triaged labels.

[munificent]

pub list doesn't really do anything at the moment. It was being used for some tests, but it's temporarily dead.

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Added Invalid label.

[DartBot]

This issue has been moved to dart-lang/pub#40.