fix conan list for packages with no settings or options

conans/search/search.py

@@ -55,14 +55,14 @@ def compatible_prop(setting_value, _prop_value):
         return (_prop_value == setting_value) or (_prop_value == "None" and setting_value is None)
 
     # TODO: Necessary to generalize this query evaluation to include all possible fields
-    info_settings = binary_info.get("settings")
-    info_options = binary_info.get("options")
+    info_settings = binary_info.get("settings", {})
+    info_options = binary_info.get("options", {})
 
     if not prop_name.startswith("options."):
-        return compatible_prop(info_settings.get(prop_name, None), prop_value)
+        return compatible_prop(info_settings.get(prop_name), prop_value)
     else:
         prop_name = prop_name[len("options."):]
-        return compatible_prop(info_options.get(prop_name, None), prop_value)
+        return compatible_prop(info_options.get(prop_name), prop_value)
 
 
 def search_recipes(cache, pattern=None, ignorecase=True):

conans/test/integration/command_v2/list_test.py

@@ -10,7 +10,7 @@
 
 from conans.errors import ConanException, ConanConnectionError
 from conans.test.assets.genconanfile import GenConanfile
-from conans.test.utils.tools import TestClient, TestServer
+from conans.test.utils.tools import TestClient, TestServer, NO_SETTINGS_PACKAGE_ID
 from conans.util.env import environment_update
 from conans.util.files import load, save
 
@@ -615,6 +615,24 @@ def test_list_query_options():
     assert "myoption: 3" not in c.out
 
 
+def test_list_empty_settings():
+    """
+    If settings are empty, do not crash
+    """
+    c = TestClient(default_server_user=True)
+    c.save({"conanfile.py": GenConanfile("pkg", "1.0")})
+    c.run("create .")
+
+    c.run("list pkg/1.0:* -p os=Windows -f=json")
+    revisions = json.loads(c.stdout)["Local Cache"]["pkg/1.0"]["revisions"]
+    pkgs = revisions["a69a86bbd19ae2ef7eedc64ae645c531"]["packages"]
+    assert pkgs == {}
+    c.run("list pkg/1.0:* -p os=None -f=json")
+    revisions = json.loads(c.stdout)["Local Cache"]["pkg/1.0"]["revisions"]
+    pkgs = revisions["a69a86bbd19ae2ef7eedc64ae645c531"]["packages"]
+    assert pkgs == {NO_SETTINGS_PACKAGE_ID: {"info": {}}}
+
+
 class TestListNoUserChannel:
     def test_no_user_channel(self):
         c = TestClient(default_server_user=True)