Missing default value for --output in otatool.py read_ota_partition (IDFGH-4756)

[Foalyy]

Environment

• Development Kit: none
• Module or chip used: ESP32-WROOM-32D
• IDF version : v4.4-dev-4-g73db14240
• Build System: idf.py
• Operating System: Linux
• Using an IDE?: No
• Power Supply: external 3.3V

Problem Description

When otatool.py is run without the --output argument, such as in the example in the OTA documentation, like this :

otatool.py read_ota_partition --name=ota_0

the tool returns an unhelping error :

  File "[...]esp-idf/components/partition_table/parttool.py", line 136, in _call_esptool
       print('Running %s...' % (' '.join(esptool_args)))
TypeError: sequence item 5: expected str instance, NoneType found

Expected Behavior

Either

• a default value for --output based on --name, such as implied in the OTA documentation : # Read OTA partition 'ota_3' and save contents to a file named 'ota_3.bin'
• or a more helpful error message

Actual Behavior

See error above