[TIMOB-14528] Allow custom properties on proxies even if they exist on other proxies
[TIMOB-14528] Allow custom properties on proxies even if they exist on other proxies

appcelerator/titanium_mobile_blackberry,appcelerator/titanium_mobile_blackberry,appcelerator/titanium_mobile_blackberry,appcelerator/titanium_mobile_blackberry,appcelerator/titanium_mobile_blackberry,appcelerator/titanium_mobile_blackberry