Alien runtime fixes

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

@@ -32,7 +32,7 @@
 
 /mob/living/carbon/alien/adjustToxLoss(amount)
 	storedPlasma = min(max(storedPlasma + amount,0),max_plasma) //upper limit of max_plasma, lower limit of 0
-	hud_used.alien_plasma_display.maptext = "<div align='center' valign='middle' style='position:relative; top:0px; left:6px'> <font color='magenta'>[storedPlasma]</font></div>"
+	updatePlasmaDisplay()
 	return
 
 /mob/living/carbon/alien/adjustFireLoss(amount) // Weak to Fire
@@ -214,3 +214,11 @@ Des: Removes all infected images from the alien.
 #undef HEAT_DAMAGE_LEVEL_1
 #undef HEAT_DAMAGE_LEVEL_2
 #undef HEAT_DAMAGE_LEVEL_3
+
+
+/mob/living/carbon/alien/proc/updatePlasmaDisplay()
+	if(hud_used) //clientless aliens
+		hud_used.alien_plasma_display.maptext = "<div align='center' valign='middle' style='position:relative; top:0px; left:6px'> <font color='magenta'>[storedPlasma]</font></div>"
+
+/mob/living/carbon/alien/larva/updatePlasmaDisplay()
+	return

code/modules/mob/living/carbon/alien/special/alien_embryo.dm

@@ -80,7 +80,7 @@
 	// he will become the alien but if he doesn't then we will set the stage
 	// to 2, so we don't do a process heavy check everytime.
 
-	if(candidates.len)
+	if(candidates && candidates.len)
 		picked = pick(candidates)
 	else if(affected_mob.client)
 		picked = affected_mob.key