dock/mac-address-passthrough return error

[Scott Hu]

Always return error below when running dock/mac-address-passthrough

I/O log:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/libsmbios_c/smbios_token.py", line 134, in __iter__
    raise StopIteration
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/sbin/smbios-token-ctl", line 475, in <module>
    sys.exit( main() )
  File "/usr/sbin/smbios-token-ctl", line 380, in main
    dumpTokens(tokenTable, tokenXlator, options)
  File "/usr/sbin/smbios-token-ctl", line 214, in dumpTokens
    for token in tokenTable:
RuntimeError: generator raised StopIteration
Command '['smbios-token-ctl', '--token-id=0x49b']' returned non-zero exit status 1.

[Additional information]
SKU: STRA-DVT2-C8, STRA-DVT2-C7
Manifest: canonical-oem-somerville-focal-amd64-20200502-85+fossa-bronn+X40
system-manufacturer: Dell Inc.
system-product-name: Precision 5750
bios-version: 1.3.2
CPU: Intel(R) Core(TM) i9-10880H CPU @ 2.30GHz (16x)
GPU: 00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:9bc4] (rev 05)
kernel-version: 5.6.0-2029-oem

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