Nymph and Scannerbed fixes (#1388)

Fixes #977 
Fixes #1380 

Fixes an unreported issue with carbon attack procs that made diona nymphs (and i guess xenomorphs and slimes too) immune to melee attacks.

Nymphs no longer gain light energy while ventcrawling. The inside of a pipe is treated as total darkness.
Nymph max health reduced by 15%. I don't want to nerf them too much.

Fixes several runtime errors in life procs, where it tried to set client vars without checking for a client. I ran into them when shooting a nymph

code/modules/mob/living/carbon/alien/diona/diona_nymph.dm

@@ -30,6 +30,7 @@
 	var/list/sampled_DNA
 	var/list/language_progress
 	var/obj/item/clothing/head/hat
+	maxHealth = 85
 
 /mob/living/carbon/alien/diona/ex_act(severity)
 	if (life_tick < 4)

code/modules/mob/living/carbon/alien/life.dm

@@ -93,6 +93,8 @@
 	return 1
 
 /mob/living/carbon/alien/handle_regular_hud_updates()
+	if (!..())
+		return//Returns if no client
 
 	if (stat == 2 || (XRAY in src.mutations))
 		sight |= SEE_TURFS
@@ -128,8 +130,7 @@
 		else
 			healths.icon_state = "health7"
 
-	if (client)
-		client.screen.Remove(global_hud.blurry,global_hud.druggy,global_hud.vimpaired)
+	client.screen.Remove(global_hud.blurry,global_hud.druggy,global_hud.vimpaired)
 
 	if ((blind && stat != 2))
 		if ((blinded))

code/modules/mob/living/carbon/carbon_defense.dm

@@ -1,9 +1,9 @@
 
 //Called when the mob is hit with an item in combat.
-/mob/living/carbon/resolve_item_attack(obj/item/I, mob/living/user, var/effective_force, var/hit_zone)
+/mob/living/carbon/resolve_item_attack(obj/item/I, mob/living/user, var/hit_zone)
 	if(check_attack_throat(I, user))
 		return null
-	..()
+	return ..()
 
 /mob/living/carbon/standard_weapon_hit_effects(obj/item/I, mob/living/user, var/effective_force, var/blocked, var/hit_zone)
 	if(!effective_force || blocked >= 2) 

code/modules/mob/living/carbon/diona_base.dm

@@ -450,6 +450,9 @@ if (flashlight_active)
 	var/light_amount = DIONA_MAX_LIGHT //how much light there is in the place, affects receiving nutrition and healing
 	var/light_factor = 1//used for  if a gestalt's response node is damaged. it will feed more slowly
 
+	if (is_ventcrawling)
+		return -1.5//no light inside pipes
+
 	if (DS.light_organ)
 		if (DS.light_organ.is_broken())
 			light_factor = 0.55