private static boolean isBadVariable(VariableSymbolDB varSym) {
		return varSym.getAddress() == Address.NO_ADDRESS ||
			varSym.getVariableStorage().isBadStorage();
	}
@see ghidra.program.model.listing.Function#getStackFrame()
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/function/FunctionDB.java