fix: ParseException raising in parsers.scsi

[JoySnow]

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Complete Description of Additions/Changes:

for RHINENG-9677

Raise SkipComponent instead of ParseException for the empty content case.

count	component	request_id	exception
53234	insights.specs.Specs.scsi	some-request-id	ParseException('Empty content of file /proc/scsi/scsi', [])
53234	insights.parsers.scsi.SCSI	some-request-id	ParseException('Empty content of file /proc/scsi/scsi', [])