if-statement in build_empty_mw_link_record_array() might cause silent error

[cchwala]

There is a if-statement in the following lines of code which seems unnecessary and which might cause a silent error (in line 294) when a oid_dict key is TX_level or RX_level.

pySNMPdaq/pySNMPdaq.py

Lines 286 to 296 in 1714b8c

	for oid_name in oid_dict:
	if (oid_name != 'RX_level' and oid_name != 'TX_level'):
	dtype_list.append((oid_name, np.float64))
	mw_link_record = np.empty((1, ), dtype=dtype_list)
	# Set all numeric entries to NaN
	mw_link_record['RTT'] = np.NaN
	for oid in oid_dict:
	mw_link_record[oid] = np.NaN
	return mw_link_record

Provided that this if-statement is not required it should be removed.