Build: Fix empty install commands

Former-commit-id: 42abd0d02836ee466821da11bc34bbe4acc30389 [formerly 0031006522b6c8910fae4c7b72eaf05cda23dcea]
Former-commit-id: 11ed91151aa8db729bea196ca9705a6e60f260bb

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();