Do not release enumerator when query fails since it will be null.
Do not release enumerator when query fails since it will be null.

[#458]

appcelerator/titanium_desktop,wyrover/titanium_desktop,appcelerator/titanium_desktop,wyrover/titanium_desktop,jvkops/titanium_desktop,wyrover/titanium_desktop,wyrover/titanium_desktop,appcelerator/titanium_desktop,jvkops/titanium_desktop,jvkops/titanium_desktop,wyrover/titanium_desktop,wyrover/titanium_desktop,jvkops/titanium_desktop,appcelerator/titanium_desktop,jvkops/titanium_desktop,appcelerator/titanium_desktop,jvkops/titanium_desktop