private static Writer getNullWriter() {
		if (nullWriter == null) {
			nullWriter = new NullWriter();
		}
		return nullWriter;
	}
Returns a {@link NullWriter} for the log file when chosen instead of a FileWriter.  If
one already exists, it is returned.  Otherwise a new one is created
@return a {@link NullWriter} for the log file
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/PdbLog.java