Add null checks for W3DDisplay::m_3DScene

Author: helmutbuhler

GeneralsMD/Code/GameEngineDevice/Source/W3DDevice/GameClient/Drawable/Draw/W3DRopeDraw.cpp

@@ -107,8 +107,8 @@ void W3DRopeDraw::buildSegments()
 																	 m_color.blue,  // blue
 																	 0.5f );  // transparency
 
-		W3DDisplay::m_3DScene->Add_Render_Object( info.line );
-		W3DDisplay::m_3DScene->Add_Render_Object( info.softLine );
+		if (W3DDisplay::m_3DScene) W3DDisplay::m_3DScene->Add_Render_Object( info.line );
+		if (W3DDisplay::m_3DScene) W3DDisplay::m_3DScene->Add_Render_Object( info.softLine );
 		m_segments.push_back(info);
 	}
 }
@@ -122,12 +122,12 @@ void W3DRopeDraw::tossSegments()
 	{
 		if (it->line)
 		{
-			W3DDisplay::m_3DScene->Remove_Render_Object(it->line);
+			if (W3DDisplay::m_3DScene) W3DDisplay::m_3DScene->Remove_Render_Object(it->line);
 			REF_PTR_RELEASE((it->line));
 		}
 		if (it->softLine)
 		{
-			W3DDisplay::m_3DScene->Remove_Render_Object(it->softLine);
+			if (W3DDisplay::m_3DScene) W3DDisplay::m_3DScene->Remove_Render_Object(it->softLine);
 			REF_PTR_RELEASE((it->softLine));
 		}
 	}