Safety check to stop an assert I got when alt+f4ing. This probably shouldn't happen normally, I blame the dumb metagame

Author: garethyr

Managers/PostProcessMan.cpp

@@ -204,13 +204,15 @@ namespace RTE {
 		bool unseen = false;
 		Vector postEffectPosRelativeToBox;
 
-		for (PostEffect &scenePostEffect : m_PostSceneEffects) {
-			if (team != Activity::NoTeam) { unseen = g_SceneMan.IsUnseen(scenePostEffect.m_Pos.GetFloorIntX(), scenePostEffect.m_Pos.GetFloorIntY(), team); }
-
-			if (WithinBox(scenePostEffect.m_Pos, boxPos, static_cast<float>(boxWidth), static_cast<float>(boxHeight)) && !unseen) {
-				found = true;
-				postEffectPosRelativeToBox = scenePostEffect.m_Pos - boxPos;
-				effectsList.push_back(PostEffect(postEffectPosRelativeToBox, scenePostEffect.m_Bitmap, scenePostEffect.m_BitmapHash, scenePostEffect.m_Strength, scenePostEffect.m_Angle));
+		if (g_SceneMan.GetScene()) {
+			for (PostEffect &scenePostEffect : m_PostSceneEffects) {
+				if (team != Activity::NoTeam) { unseen = g_SceneMan.IsUnseen(scenePostEffect.m_Pos.GetFloorIntX(), scenePostEffect.m_Pos.GetFloorIntY(), team); }
+
+				if (WithinBox(scenePostEffect.m_Pos, boxPos, static_cast<float>(boxWidth), static_cast<float>(boxHeight)) && !unseen) {
+					found = true;
+					postEffectPosRelativeToBox = scenePostEffect.m_Pos - boxPos;
+					effectsList.push_back(PostEffect(postEffectPosRelativeToBox, scenePostEffect.m_Bitmap, scenePostEffect.m_BitmapHash, scenePostEffect.m_Strength, scenePostEffect.m_Angle));
+				}
 			}
 		}
 		return found;