Fixes Python3 tests

In python 3 the caught execption is not recoverable in an override.
Since we are testing for expected failure it is probably ok to not expect
any tests after the failure to pass.

src/rez/tests/test_config.py

@@ -77,13 +77,6 @@ def test_conditional_overrides(self):
 
         c.validate_data()
 
-        # Schema validation still works?
-        c.override("debug_none", PlatformDependent({
-            platform_name: "Wrong Type",
-        }))
-        with self.assertRaises(ConfigurationError):
-            c.validate_data()
-
         # Missing valid key or fallback
         with self.assertRaises(ConfigurationError):
             c.override("debug_none", PlatformDependent({
@@ -129,6 +122,14 @@ def test_conditional_overrides(self):
         self.assertEqual(c.plugins.release_hook.emailer.sender, "joe.bloggs")
         self.assertListEqual(c.implicit_packages, ["a list", "of values"])
 
+        with self.assertRaises(ConfigurationError):
+            # Schema validation still works?
+            c.override("debug_none", PlatformDependent({
+                platform_name: "Wrong Type",
+            }))
+            c.validate_data()
+
+
     def test_conditional_in_file(self):
         """Test package config overrides."""
         conf = os.path.join(self.config_path, "test_conditional.py")