Commits on Jun 22, 2017

1. Allow rustup to handle unavailable packages …

   Before this, if a package was unavailable (like nightly is at the moment),
   it would error out with a message like "error: missing key: 'url'" because
   at the moment a few of the rust-analysis packages didn't build. This resulted
   in the `channel-rust-nightly.toml` to be created with blocks like this:
   
   ```toml
   [pkg.rust-analysis.target.aarch64-apple-ios]
   available = false
   
   [pkg.rust-analysis.target.aarch64-linux-android]
   available = false
   
   [pkg.rust-analysis.target.aarch64-unknown-fuchsia]
   available = false
   
   [pkg.rust-analysis.target.aarch64-unknown-linux-gnu]
   available = true
   hash = "be50ffa6f94770929b53bae553977cb6d78b03506f033d14a7251c7b0cdb9035"
   url = "https://static.rust-lang.org/dist/2017-04-13/rust-analysis-nightly-aarch64-unknown-linux-gnu.tar.gz"
   ```
   
   rustup assumed that there'd always be a `hash` and `url`, which is not
   the case when packages are unavaible. This patch then just updates
   rustup to handle their absence.

   

   erickt authored and brson committed Jun 22, 2017
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