fix: 'NoneType' AttributeError in insights-info

[JoySnow]

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Complete Description of Additions/Changes:

fix this below error of insights-info run:

$ insights-info insights.specs.Specs.hosts  
Traceback (most recent call last):
  File "/Users/joy/Work/insights-core/venv/bin/insights-info", line 33, in <module>
    sys.exit(load_entry_point('insights-core', 'console_scripts', 'insights-info')())
  File "/Users/joy/Work/insights-core/insights/tools/query.py", line 412, in main
    ds = get_matching_datasources(args.paths)
  File "/Users/joy/Work/insights-core/insights/tools/query.py", line 193, in get_matching_datasources
    if matches(d, path):
  File "/Users/joy/Work/insights-core/insights/tools/query.py", line 177, in matches
    search_tgt = d.cmd.strip('/').split()[0].split('/')[-1]
AttributeError: 'NoneType' object has no attribute 'strip'