Werk #5055: quantum_libsmall_door: Fixed exception in scan function when .1.3.6.1.2.1.1.6.0 is not available

Fixes exceptions like this:

  File "/omd/sites/heute/bin/cmk", line 96, in <module>
    exit_status = modes.call(o, a, opts, args)
  File "/omd/sites/heute/lib/python/cmk_base/modes/__init__.py", line 80, in call
    return mode.handler_function(*handler_args)
  File "/omd/sites/heute/lib/python/cmk_base/modes/check_mk.py", line 1380, in mode_discover
    options["discover"] == 1)
  File "/omd/sites/heute/lib/python/cmk_base/discovery.py", line 110, in do_discovery
    _do_discovery_for(hostname, check_types, only_new, use_caches, on_error)
  File "/omd/sites/heute/lib/python/cmk_base/discovery.py", line 131, in _do_discovery_for
    new_items = _discover_services(hostname, check_types, use_caches, do_snmp_scan, on_error)
  File "/omd/sites/heute/lib/python/cmk_base/discovery.py", line 750, in _discover_services
    check_types = _gather_check_types_native(hostname, ipaddress, on_error, do_snmp_scan)
  File "/omd/sites/heute/lib/python/cmk_base/discovery.py", line 681, in _gather_check_types_native
    check_types = snmp_scan(hostname, ipaddress, on_error)
  File "/omd/sites/heute/lib/python/cmk_base/discovery.py", line 846, in snmp_scan
    result = scan_function(oid_function)
  File "/omd/sites/heute/share/check_mk/checks/quantum_libsmall_door", line 49, in <lambda>
    and "library" in oid(".1.3.6.1.2.1.1.6.0").lower(),
AttributeError: 'NoneType' object has no attribute 'lower'

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