Fixes *some* CI issues (#11461)

code/ATMOSPHERICS/components/binary_devices/passive_gate.dm

@@ -60,8 +60,8 @@
 		var/turf/T = get_turf(src)
 		if(!istype(T))
 			return
-		add_underlay(T, node1, turn(dir, 180), node1.icon_connect_type)
-		add_underlay(T, node2, dir, node2.icon_connect_type)
+		add_underlay(T, node1, turn(dir, 180), node1?.icon_connect_type)
+		add_underlay(T, node2, dir, node2?.icon_connect_type)
 
 /obj/machinery/atmospherics/binary/passive_gate/hide(var/i)
 	update_underlays()

code/unit_tests/recipe_tests.dm

@@ -9,8 +9,7 @@
 /datum/unit_test/research_design_cost/start_test()
 	var/tested_count = 0
 	var/error_count = 0
-	for(var/T in subtypesof(/datum/design))
-		var/datum/design/D = new T
+	for(var/datum/design/D in designs)
 		if(ispath(D.build_path, /obj/item))
 			var/obj/item/I = D.Fabricate()
 			if(I.matter && D.materials && I.recyclable) // non-recyclable items can't be exploited
@@ -40,8 +39,8 @@
 /datum/unit_test/stack_recipe_cost/start_test()
 	var/tested_count = 0
 	var/error_count = 0
-	for(var/T in subtypesof(/material))
-		var/material/D = new T
+	SSmaterials.create_material_lists() // just in case
+	for(var/material/D in SSmaterials.materials)
 		var/list/datum/stack_recipe_list/recipe_lists = D.get_recipes()
 		var/list/temp_matter = D.get_matter()
 		for(var/datum/stack_recipe_list/L in recipe_lists)

html/changelogs/mdp-ci-tweaks.yml

@@ -0,0 +1,43 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes:
+#   bugfix
+#   wip (For works in progress)
+#   tweak
+#   soundadd
+#   sounddel
+#   rscadd (general adding of nice things)
+#   rscdel (general deleting of nice things)
+#   imageadd
+#   imagedel
+#   maptweak
+#   spellcheck (typo fixes)
+#   experiment
+#   balance
+#   admin
+#   backend
+#   security
+#   refactor
+#################################
+
+# Your name.
+author: MoondancerPony
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, all entries are changed into a single [] after a master changelog generation. Just remove the brackets when you add new entries.
+# Please surround your changes in  double quotes ("), as certain characters otherwise screws up compiling. The quotes will not show up in the changelog.
+changes:
+  - backend: "CI recipe tests no longer reinstantiate singletons."
+  - maptweak: "Exodus loads properly again."
+  - bugfix: "Fixes a runtime with atmos components."