Exceptional situation for CPUMonitor

[roscisz]

Exception in thread MonitoringService_Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/home/tensorhive/TensorHive/tensorhive/core/utils/StoppableThread.py", line 18, in run
    self.do_run()
  File "/home/tensorhive/TensorHive/tensorhive/core/services/MonitoringService.py", line 41, in do_run
    monitor.update(self.connection_manager.connections, self.infrastructure_manager)
  File "/home/tensorhive/TensorHive/tensorhive/core/monitors/CPUMonitor.py", line 23, in update
    metrics[uuid]['metrics']['utilization'] = {'unit': '%', 'value': float(stdout_lines[0])}
ValueError: could not convert string to float: 'Mem:         257868       45346       49578          24      162943      210254'