Attempt at fix of #11014:

Create an empty hex for dark assassin by carving out a wall if there
is no space around unit triggering moveto event. Can't test the
behavior as there is no save with offending case.

data/campaigns/Under_the_Burning_Suns/scenarios/08_Out_of_the_Frying_Pan.cfg

@@ -3522,6 +3522,29 @@
             [/not]
         [/store_locations]
 
+		[if]
+			[variable]
+				name=cloaked.length
+				equals=0
+			[/variable]
+			[then]
+				[store_locations]
+					variable=fake_cave
+					x=$x1
+					y=$y1
+					radius=1
+					terrain=Xu
+				[/store_locations]
+				[terrain]
+					x,y=$fake_cave[0].x,$fake_cave[0].y
+					terrain=Uu
+				[/terrain]
+				{VARIABLE cloaked.x $fake_cave[0].x}
+				{VARIABLE cloaked.y $fake_cave[0].y}
+				{CLEAR_VARIABLE fake_cave}
+			[/then]
+		[/if]
+		
         [unit]
             type=Dark Assassin3
             description=Cloaked Figure