@Override
	public boolean hasLabelHistory(Address addr) {
		try {
			RecordIterator iter = historyAdapter.getRecordsByAddress(addrMap.getKey(addr, false));
			return iter.hasNext();
		}
		catch (IOException e) {
			program.dbError(e);
		}
		return false;
	}
Returns the next available external symbol address

@return the address
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/symbol/SymbolManager.java