public String getUniqifierString() {
		if (pdbIdentifiers.getGuid() != null) {
			return pdbIdentifiers.getGuid().toString().replace("-", "").toUpperCase();
		}
		if (pdbIdentifiers.getSignature() != 0) {
			return String.format("%08X", pdbIdentifiers.getSignature());
		}
		return "";
	}
A string that represents the unique fingerprint of a Pdb file, or empty "" if
invalid.  Does not include the age.

@return either GUID str or signature hexstring or "" if neither
Ghidra/Features/PDB/src/main/java/pdb/symbolserver/SymbolFileInfo.java