code: function parseTokens(entry, env)
  {
    var found = 0;
  
    if (entry.indexOf('${') > -1)
    {
      entry = entry.replace(/\$\{([^}]+)\}/g, function(match, token)
      {
        var value = getVar.call(this, token, env);
  
        // need to have `found` counter
        // to see if any of the variables
        // in the string were resolved
        if (hasValue(value))
        {
          found++;
        }
  
        return value;
      }.bind(this));
    }
  
    // reset entry if no variables were resolved
    if (!found) entry = '';
  
    return entry;
  }
docs: Parses provided config entry
  to find variable placeholders
  and replace them with values
  
  @param   {string} entry - string to parse
  @param   {object} env - object to search within
  @returns {string|boolean} - replaced string or empty string
  if no matching variables found