title: Create empty conda environment
body: <p>I can create a new conda environment, with program <code>biopython</code> with this:</p>
  
  <pre><code>conda create --name snowflakes biopython
  </code></pre>
  
  <p>What if I do not want to install any program? It seems I can not do that:</p>
  
  <pre><code>» conda create --name tryout
  Error: too few arguments, must supply command line package specs or --file
  
  You can specify one or more default packages to install when creating
  an environment.  Doing so allows you to call conda create without
  explicitly providing any package names.
  
  To set the provided packages, call conda config like this:
  
      conda config --add create_default_packages PACKAGE_NAME
  </code></pre>