Fixes several issues with drones.

code/modules/mob/living/silicon/robot/drone/drone.dm

@@ -42,7 +42,7 @@ var/list/mob_hat_cache = list()
 	mob_push_flags = SIMPLE_ANIMAL
 	mob_always_swap = 1
 
-	mob_size = MOB_TINY
+	mob_size = MOB_LARGE // Small mobs can't open doors, it's a huge pain for drones.
 
 	//Used for self-mailing.
 	var/mail_destination = ""
@@ -70,7 +70,6 @@ var/list/mob_hat_cache = list()
 	can_pull_mobs = 1
 	hat_x_offset = 1
 	hat_y_offset = -12
-	mob_size = MOB_SMALL
 
 /mob/living/silicon/robot/drone/New()
 

code/modules/mob/living/silicon/robot/robot.dm

@@ -219,14 +219,15 @@
 	return ..()
 
 /mob/living/silicon/robot/proc/set_module_sprites(var/list/new_sprites)
-	module_sprites = new_sprites.Copy()
-	//Custom_sprite check and entry
-	if (custom_sprite == 1)
-		module_sprites["Custom"] = "[src.ckey]-[modtype]"
-		icontype = "Custom"
-	else
-		icontype = module_sprites[1]
-	icon_state = module_sprites[icontype]
+	if(new_sprites && new_sprites.len)
+		module_sprites = new_sprites.Copy()
+		//Custom_sprite check and entry
+		if (custom_sprite == 1)
+			module_sprites["Custom"] = "[src.ckey]-[modtype]"
+			icontype = "Custom"
+		else
+			icontype = module_sprites[1]
+			icon_state = module_sprites[icontype]
 	updateicon()
 	return module_sprites