docs: def generate_bind_list(self, bindlist=None):
      '''generate bind string will take a single string or list of binds, and
         return a list that can be added to an exec or run command. For example,
         the following map as follows:
  
        ['/host:/container', '/both'] --> ["--bind", "/host:/container","--bind","/both" ]
        ['/both']                     --> ["--bind", "/both"]
        '/host:container'             --> ["--bind", "/host:container"]
         None                         --> []
   
         An empty bind or otherwise value of None should return an empty list.
         The binds are also checked on the host.
  
         Parameters
         ==========
         bindlist: a string or list of bind mounts
  
      '''
      binds = []
      
      # Case 1: No binds provided
      if not bindlist:
          return binds
  
      # Case 2: provides a long string or non list, and must be split
      if not isinstance(bindlist, list):
          bindlist = bindlist.split(' ')
  
      for bind in bindlist:
  
          # Still cannot be None
          if bind:
              bot.debug('Adding bind %s' %bind)
              binds += ['--bind', bind]
  
              # Check that exists on host
              host = bind.split(':')[0]
              if not os.path.exists(host):
                  bot.error('%s does not exist on host.' %bind)
                  sys.exit(1)
  
      return binds