private static DWARFFile fixupDir(DWARFFile dir, String defaultCompDir) {
		// fix relative dir names using the compiledir string from the CU
		if (!defaultCompDir.isEmpty()) {
			if (dir.getName().equals(".")) {
				return dir.withName(defaultCompDir);
			}
			else if (!isAbsolutePath(dir.getName())) {
				return dir.withName(FSUtilities.appendPath(defaultCompDir, dir.getName()));
			}
		}
		return dir;
	}
Returns a dummy DWARFLine instance that contains no information.

@return {@link DWARFLine} instance with no info
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/line/DWARFLine.java