Fixed crash when used on PB without screen

Fancy flight info/AAA_Description.cs

@@ -20,7 +20,7 @@ namespace IngameScript
 {
 	#region untouched
 	/*
-	Blargmode's Fancy Flight Info (FFI) (V4.0.3, 2019-05-09)
+	Blargmode's Fancy Flight Info (FFI) (V4.0.4, 2020-02-29)
 
 	This script gives you free hands in creating a fancy cockpit with data about your ship. 
 	When this project started, I intended to replace the awful hud, then the hud got better. Now it's mostly for looks. 
@@ -38,9 +38,9 @@ namespace IngameScript
 
 	This place is not good for describing this. Go to the workshop for detailed info. 
 
-	Setup guide: https://steamcommunity.com/sharedfiles/filedetails/?id=907697156
+	Setup guide: http://blargmode.se/ffi-guide/
 
-	If you refuse or can't visit the workshop/watch the setup video, there is a way.
+	If you can't visit the guide, there is a way.
 	You can figure out a whole lot in-game as well if you're a bit crafty. Start by loading a preload like this:
 	1. Type the following 3 lines in Custom Data of a block with screens, e.g. an LCD panel.
 	   [FFI 1]

Fancy flight info/Main.cs

@@ -60,11 +60,14 @@ public class Program : MyGridProgram
 
 		public Program()
 		{
-			pbSurface = Me.GetSurface(0);
-			pbSM = new SurfaceMath(pbSurface);
-			pbSurface.ContentType = ContentType.SCRIPT;
-			pbSurface.Script = "";
-			if (pbSurface.ScriptBackgroundColor != problemBG) defaultBG = pbSurface.ScriptBackgroundColor;
+			if(Me.SurfaceCount > 0)
+			{
+				pbSurface = Me.GetSurface(0);
+				pbSM = new SurfaceMath(pbSurface);
+				pbSurface.ContentType = ContentType.SCRIPT;
+				pbSurface.Script = "";
+				if (pbSurface.ScriptBackgroundColor != problemBG) defaultBG = pbSurface.ScriptBackgroundColor;
+			}
 
 			InitPreloads();
 
@@ -464,6 +467,7 @@ void PrintDetailedInfo()
 		int heartBeatIndex = 0;
 		void DrawOutsidePBLcd()
 		{
+			if (pbSurface == null) return;
 			using (var frame = pbSurface.DrawFrame())
 			{
 				Vector2 headerPos = new Vector2(pbSM.Center.X, pbSM.Center.Y - pbSM.Size.Y * 0.333f);