@Override
	public boolean hasNext() {
		if (nextSymbol != null) {
			return true;
		}
		return findNext();
	}
@see ghidra.program.model.symbol.SymbolIterator#hasNext()
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/symbol/TypeFilteredSymbolIterator.java