fix data sharing race condition

server/scripts/modules/weatherdisplay.js

@@ -20,6 +20,7 @@ class WeatherDisplay {
 		this.data = undefined;
 		this.loadingStatus = STATUS.loading;
 		this.name = name?name:elemId;
+		this.getDataCallbacks = [];
 
 		// default navigation timing
 		this.timing = {
@@ -126,6 +127,14 @@ class WeatherDisplay {
 		return true;
 	}
 
+	// return any data requested before it was available
+	getDataCallback() {
+		// call each callback
+		this.getDataCallbacks.forEach(fxn => fxn(this.data));
+		// clear the callbacks
+		this.getDataCallbacks = [];
+	}
+
 	drawCanvas() {
 		// stop all gifs
 		this.gifs.forEach(gif => gif.pause());