cmd/go: slightly less confusing error message If the argument to go fix isn't a package directory, the message said nothing helpful. Now it at least says a package couldn't be found.
cmd/go: slightly less confusing error message
If the argument to go fix isn't a package directory, the message said nothing helpful.
Now it at least says a package couldn't be found.

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/5577072

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