Build: Fix empty install commands

Former-commit-id: 7083dfd9716873707791d46bc1fe333a6e229712 [formerly a8122cb99bcf5023ffad732fbf8d2b922faf1252]
Former-commit-id: b9913ad6e47551044afd0259f9a1b64b82b1a743

include/Nazara/Graphics/ParticleGroup.hpp

@@ -8,6 +8,7 @@
 #define NAZARA_PARTICLEGROUP_HPP
 
 #include <Nazara/Prerequesites.hpp>
+#include <Nazara/Core/signal.hpp>
 #include <Nazara/Graphics/ParticleController.hpp>
 #include <Nazara/Graphics/ParticleDeclaration.hpp>
 #include <Nazara/Graphics/ParticleEmitter.hpp>
@@ -62,6 +63,9 @@ namespace Nz
 
 			ParticleGroup& operator=(const ParticleGroup& emitter);
 
+			// Signals:
+			NazaraSignal(OnParticleGroupRelease, const ParticleGroup* /*particleGroup*/);
+
 		private:
 			void MakeBoundingVolume() const override;
 			void ResizeBuffer();