title: WARNING: The remote server could not find the noarch directory for the requested channel
body: <p>I'm seeing strange errors from conda when I attempt to install a package.  Merely searching for packages results in strange warnings like the following.  What's going on?</p>
  
  <pre><code>(base) $ conda search libdvid-cpp
  Fetching package metadata ....
  WARNING: The remote server could not find the noarch directory for the
  requested channel with url: https://conda.anaconda.org/flyem-forge
  
  It is possible you have given conda an invalid channel. Please double-check
  your conda configuration using `conda config --show`.
  
  If the requested url is in fact a valid conda channel, please request that the
  channel administrator create `noarch/repodata.json` and associated
  `noarch/repodata.json.bz2` files, even if `noarch/repodata.json` is empty.
  $ mkdir noarch
  $ echo '{}' &gt; noarch/repodata.json
  $ bzip2 -k noarch/repodata.json
  ..
  WARNING: The remote server could not find the noarch directory for the
  requested channel with url: https://conda.anaconda.org/conda-forge
  
  It is possible you have given conda an invalid channel. Please double-check
  your conda configuration using `conda config --show`.
  
  If the requested url is in fact a valid conda channel, please request that the
  channel administrator create `noarch/repodata.json` and associated
  `noarch/repodata.json.bz2` files, even if `noarch/repodata.json` is empty.
  $ mkdir noarch
  $ echo '{}' &gt; noarch/repodata.json
  $ bzip2 -k noarch/repodata.json
  .........
  
  PackageNotFoundError: Packages missing in current channels:
  
   - [('libdvid-cpp',)]
  
  We have searched for the packages in the following channels:
  
   - https://conda.anaconda.org/flyem-forge/osx-64
   - https://conda.anaconda.org/flyem-forge/noarch
   - https://conda.anaconda.org/conda-forge/osx-64
   - https://conda.anaconda.org/conda-forge/noarch
   - https://repo.continuum.io/pkgs/main/osx-64
   - https://repo.continuum.io/pkgs/main/noarch
   - https://repo.continuum.io/pkgs/free/osx-64
   - https://repo.continuum.io/pkgs/free/noarch
   - https://repo.continuum.io/pkgs/r/osx-64
   - https://repo.continuum.io/pkgs/r/noarch
   - https://repo.continuum.io/pkgs/pro/osx-64
   - https://repo.continuum.io/pkgs/pro/noarch
  </code></pre>