private ProgramLocation getProgramLocation(SymbolNode symbolNode) {
		Symbol symbol = symbolNode.getSymbol();
		if (symbol instanceof FunctionSymbol) {
			return new FunctionSignatureFieldLocation(symbol.getProgram(), symbol.getAddress());
		}
		return symbol.getProgramLocation();
	}
We need this when our plugin is loaded before the service we are using
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/symboltree/actions/ShowSymbolReferencesAction.java