docs: def get_process_properties(self, pid=None, name=None):
          '''
          get_process_properties(self, pid=None, name=None)
  
          Get process properties (both input and output properties)
  
          :Parameters:
          * *pid* (`string`) -- Identifier of an existing process
          * *name* (`string`) -- optional - Property name
  
          '''
          pid = self._get_pid(pid)
          res = self._call_rest_api('get', '/processes/'+pid+'/properties', error='Failed to fetch process properties')
          if name:
              try:
                  return res[name]
              except KeyError as e:
                  raise OperetoClientError(message='Invalid property [%s]'%name, code=404)
          else:
              return res