VOID_HUD: Now using GetWindowHandler for exception-protection.
VOID_HUD: Now using GetWindowHandler for exception-protection.

--- a/VOID_HUD.cs
+++ b/VOID_HUD.cs
@@ -239,7 +239,7 @@
 			this.leftHUDPos.value = GUI.Window(
 				this.core.windowID,
 				this.leftHUDPos,
-				this.leftHUDWindow,
+				VOID_Tools.GetWindowHandler(this.leftHUDWindow),
 				GUIContent.none,
 				GUIStyle.none
 			);
@@ -247,7 +247,7 @@
 			this.rightHUDPos.value = GUI.Window(
 				this.core.windowID,
 				this.rightHUDPos,
-				this.rightHUDWindow,
+				VOID_Tools.GetWindowHandler(this.rightHUDWindow),
 				GUIContent.none,
 				GUIStyle.none
 			);
@@ -289,7 +289,10 @@
 			"Downrange Distance",
 			delegate() {
 
-			if (core.vessel.mainBody != Planetarium.fetch.Home)
+			if (core.vessel == null ||
+				Planetarium.fetch == null ||
+				core.vessel.mainBody != Planetarium.fetch.Home
+			)
 			{
 				return double.NaN;
 			}