The Messenger: fix generation failure for no portal shuffle with 3 available portals (#3200)

worlds/messenger/__init__.py

@@ -155,7 +155,8 @@ class MessengerWorld(World):
             self.starting_portals.append("Searing Crags Portal")
             portals_to_strip = [portal for portal in ["Riviere Turquoise Portal", "Sunken Shrine Portal"]
                                 if portal in self.starting_portals]
-            self.starting_portals.remove(self.random.choice(portals_to_strip))
+            if portals_to_strip:
+                self.starting_portals.remove(self.random.choice(portals_to_strip))
 
         self.filler = FILLER.copy()
         if self.options.traps:

worlds/messenger/test/test_portals.py

@@ -4,6 +4,10 @@ from ..portals import PORTALS
 
 
 class PortalTestBase(MessengerTestBase):
+    options = {
+        "available_portals": 3,
+    }
+
     def test_portal_reqs(self) -> None:
         """tests the paths to open a portal if only that portal is closed with vanilla connections."""
         # portal and requirements to reach it if it's the only closed portal