CLI command 'show interface status' returns traceback instead of error's reason

[OleksandrKozodoi]

Description
CLI command 'show interface status' returns python's traceback when it's failed to get interface_speed object (i.e. containers snmp, mgmt-framework, dhcp_relay, radv, syncd, teamd, swss are stopped for some reason)

Steps to reproduce the issue

1. Stop snmp, mgmt-framework, dhcp_relay, radv, syncd, teamd, swss containers
2. Execute show interfaces status

Describe the results you received

admin@dut:~$ show interfaces status | grep up                                                                               
Traceback (most recent call last):                                                                                                  
  File "/usr/bin/intfutil", line 535, in <module>                                                                                   
    main(sys.argv[1:])                                                                                                              
  File "/usr/bin/intfutil", line 528, in main                                                                                       
    interface_stat = IntfStatus(intf_name)                                                                                          
  File "/usr/bin/intfutil", line 449, in __init__                                                                                   
    self.portchannel_speed_dict = po_speed_dict(self.po_int_dict, self.appl_db)                                                     
  File "/usr/bin/intfutil", line 275, in po_speed_dict                                                                              
    interface_speed = '{}G'.format(interface_speed[:-3])                                                                            
TypeError: 'NoneType' object has no attribute '__getitem__'  

Describe the results you expected
Corresponding error message by CLI command