Fixes some runtimes, involving do_mob, observe, send_status on mulebo…

…ts, check_gas_mixture, the explosion cinematic, sleeper get_reagents_amount, and a possible (albeit unlikely) fix for throw_at

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@3478 316c924e-a436-60f5-8080-3fe189b3f50e

code/FEA/FEA_gas_mixture.dm

@@ -475,6 +475,7 @@ datum
 			return share(sharer)*/
 
 		check_gas_mixture(datum/gas_mixture/sharer)
+			if(!sharer)	return 0
 			var/delta_oxygen = (oxygen_archived - sharer.oxygen_archived)/5
 			var/delta_carbon_dioxide = (carbon_dioxide_archived - sharer.carbon_dioxide_archived)/5
 			var/delta_nitrogen = (nitrogen_archived - sharer.nitrogen_archived)/5

code/defines/procs/helpers.dm

@@ -1269,6 +1269,7 @@ proc/listclearnulls(list/list)
 	var/target_loc = target.loc
 	var/holding = user.equipped()
 	sleep(time)
+	if(!user || !target) return 0
 	if ( user.loc == user_loc && target.loc == target_loc && user.equipped() == holding && !( user.stat ) && ( !user.stunned && !user.weakened && !user.paralysis && !user.lying ) )
 		return 1
 	else

code/game/machinery/Sleeper.dm

@@ -66,11 +66,12 @@
 			dat += text("[]\t-Toxin Content %: []</FONT><BR>", (occupant.getToxLoss() < 60 ? "<font color='blue'>" : "<font color='red'>"), occupant.getToxLoss())
 			dat += text("[]\t-Burn Severity %: []</FONT><BR>", (occupant.getFireLoss() < 60 ? "<font color='blue'>" : "<font color='red'>"), occupant.getFireLoss())
 			dat += text("<HR>Paralysis Summary %: [] ([] seconds left!)<BR>", occupant.paralysis, round(occupant.paralysis / 4))
-			dat += text("Inaprovaline units: [] units<BR>", occupant.reagents.get_reagent_amount("inaprovaline"))
-			dat += text("Soporific: [] units<BR>", occupant.reagents.get_reagent_amount("stoxin"))
-			dat += text("Dermaline: [] units<BR>", occupant.reagents.get_reagent_amount("dermaline"))
-			dat += text("Bicaridine: [] units<BR>", occupant.reagents.get_reagent_amount("bicaridine"))
-			dat += text("Dexalin: [] units<BR>", occupant.reagents.get_reagent_amount("dexalin"))
+			if(occupant.reagents)
+				dat += text("Inaprovaline units: [] units<BR>", occupant.reagents.get_reagent_amount("inaprovaline"))
+				dat += text("Soporific: [] units<BR>", occupant.reagents.get_reagent_amount("stoxin"))
+				dat += text("Dermaline: [] units<BR>", occupant.reagents.get_reagent_amount("dermaline"))
+				dat += text("Bicaridine: [] units<BR>", occupant.reagents.get_reagent_amount("bicaridine"))
+				dat += text("Dexalin: [] units<BR>", occupant.reagents.get_reagent_amount("dexalin"))
 			dat += text("<HR><A href='?src=\ref[];refresh=1'>Refresh meter readings each second</A><BR><A href='?src=\ref[];inap=1'>Inject Inaprovaline</A><BR><A href='?src=\ref[];stox=1'>Inject Soporific</A><BR><A href='?src=\ref[];derm=1'>Inject Dermaline</A><BR><A href='?src=\ref[];bic=1'>Inject Bicaridine</A><BR><A href='?src=\ref[];dex=1'>Inject Dexalin</A>", src, src, src, src, src, src)
 		else
 			dat += "The sleeper is empty."

code/game/machinery/bots/mulebot.dm

@@ -919,7 +919,7 @@
 	var/list/kv = list(
 		"type" = "mulebot",
 		"name" = suffix,
-		"loca" = loc.loc,	// area
+		"loca" = (loc ? loc.loc : "Unknown"),	// somehow loc can be null and cause a runtime - Quarxink
 		"mode" = mode,
 		"powr" = (cell ? cell.percent() : 0),
 		"dest" = destination,

code/game/throwing.dm

@@ -130,7 +130,7 @@
 	..()
 
 /atom/movable/proc/throw_at(atom/target, range, speed)
-	if(!target)	return 0
+	if(!target || !src)	return 0
 	//use a modified version of Bresenham's algorithm to get from the atom's current position to that of the target
 	src.throwing = 1
 
@@ -182,7 +182,6 @@
 				if(dist_since_sleep >= speed)
 					dist_since_sleep = 0
 					sleep(1)
-
 			a = get_area(src.loc)
 	else
 		var/error = dist_y/2 - dist_x

code/modules/mob/mob.dm

@@ -599,10 +599,11 @@
 						for (var/mob/living/silicon/decoy/D in world)
 							if (eye)
 								eye = D
-		if (eye)
-			client.eye = eye
-		else
-			client.eye = client.mob
+		if (client)
+			if (eye)
+				client.eye = eye
+			else
+				client.eye = client.mob
 
 /mob/verb/cancel_camera()
 	set name = "Cancel Camera View"
@@ -959,22 +960,24 @@ note dizziness decrements automatically in the mob's Life() proc.
 			boom.icon_state = "start"
 
 	sleep(40)
-	mob << sound('explosionfar.ogg')
-	boom.icon_state = "end"
-	if(!station_missed) flick("explode", boom)
-	else flick("explode2", boom)
+	if(boom && mob)
+		mob << sound('explosionfar.ogg')
+		boom.icon_state = "end"
+		if(!station_missed) flick("explode", boom)
+		else flick("explode2", boom)
 	sleep(40)
 
-	switch(ticker.mode.name)
-		if("nuclear emergency")
-			if(!station_missed) boom.icon_state = "loss_nuke"
-			else boom.icon_state = "loss_nuke2"
-		if("malfunction")
-			boom.icon_state = "loss_malf"
-		if("blob")
-			return//Nothin here yet and the general one does not fit.
-		else
-			boom.icon_state = "loss_general"
+	if(boom)
+		switch(ticker.mode.name)
+			if("nuclear emergency")
+				if(!station_missed) boom.icon_state = "loss_nuke"
+				else boom.icon_state = "loss_nuke2"
+			if("malfunction")
+				boom.icon_state = "loss_malf"
+			if("blob")
+				return//Nothin here yet and the general one does not fit.
+			else
+				boom.icon_state = "loss_general"
 	return