add 'frames' particles setting

src/graphics/render/Emitter.cpp

@@ -58,6 +58,9 @@ void Emitter::update(
     } else if (auto entityId = std::get_if<entityid_t>(&origin)) {
         if (auto entity = level.entities->get(*entityId)) {
             position = entity->getTransform().pos;
+        } else {
+            stop();
+            return;
         }
     }
     const float maxDistance = preset.maxDistance;
@@ -102,6 +105,10 @@ void Emitter::update(
     }
 }
 
+void Emitter::stop() {
+    count = 0;
+}
+
 bool Emitter::isDead() const {
     return count == 0;
 }