Remove hit effect in physics for no graphics STK

src/scriptengine/script_physics.cpp

@@ -21,6 +21,7 @@
 #include "script_physics.hpp"
 #include "graphics/explosion.hpp"
 #include "graphics/hit_effect.hpp"
+#include "guiengine/engine.hpp"
 #include "items/projectile_manager.hpp"
 
 namespace Scripting
@@ -33,6 +34,8 @@ namespace Scripting
         void createExplosion(asIScriptGeneric *gen)
         {
             //TODO: allow different types? sand etc
+            if (GUIEngine::isNoGraphics())
+                return;
             Vec3 *explosion_loc = (Vec3*)gen->GetArgAddress(0);
             HitEffect *he = new Explosion(*explosion_loc, "explosion", "explosion_bomb.xml");
             projectile_manager->addHitEffect(he);