Take into account that the hex size support module may not be installed (fixes #241)

src/util.js

@@ -64,7 +64,7 @@ export function getEntityCenter(token) {
 
 // A copy of this function lives in the routinglib module
 export function getAltOrientationFlagForToken(token, size) {
-	const hexSizeSupport = game.modules.get("hex-size-support").api;
+	const hexSizeSupport = game.modules.get("hex-size-support")?.api;
 	if (hexSizeSupport) {
 		return hexSizeSupport.isAltOrientation(token);
 	}