fix #2

homedecor/handlers/water_particles.lua

@@ -30,8 +30,8 @@ function homedecor.start_particle_spawner(pos, node, particledef, soundname)
 			end, s_handle)
 		end
 		minetest.delete_particlespawner(id)
-		this_spawner_meta:set_int("active", nil)
-		this_spawner_meta:set_int("sound", nil)
+		this_spawner_meta:set_int("active", "")
+		this_spawner_meta:set_int("sound", "")
 		return
 	end
 
@@ -109,6 +109,6 @@ function homedecor.stop_particle_spawner(pos)
 		end, s_handle)
 	end
 
-	this_spawner_meta:set_int("active", nil)
-	this_spawner_meta:set_int("sound", nil)
+	this_spawner_meta:set_int("active", "")
+	this_spawner_meta:set_int("sound", "")
 end