Inconsistent ConfigOverrides copy when there haven't been declared any overrides

[TuomasKiviaho]

#1347 did not implement copy properly probably because the previous commits had already forgotten their parts as well. Perhaps the ConfigOverrides workaround below explains it better.

@@ -70,12 +70,12 @@
 
     public ConfigOverrides copy()
     {
-        if (_overrides == null) {
-            return new ConfigOverrides();
-        }
-        Map<Class<?>, MutableConfigOverride> newOverrides = _newMap();
-        for (Map.Entry<Class<?>, MutableConfigOverride> entry : _overrides.entrySet()) {
-            newOverrides.put(entry.getKey(), entry.getValue().copy());
+        Map<Class<?>, MutableConfigOverride> newOverrides = null;
+        if (_overrides != null) {
+            newOverrides = _newMap();
+            for (Map.Entry<Class<?>, MutableConfigOverride> entry : _overrides.entrySet()) {
+                newOverrides.put(entry.getKey(), entry.getValue().copy());
+            }
         }
         return new ConfigOverrides(newOverrides,
                 _defaultInclusion, _defaultSetterInfo, _visibilityChecker);

[cowtowncoder]

Ah. Yes, you are right this would drop global defaults. Thank you for reporting!

[cowtowncoder]

Ah. Seems to affect 2.9 only, since 2.8 didn't hold global defaults.