Build 2706 : When back ref to a VN exists, error is not being thrown in the UI while trying to delete VN

[Ankit Jain]

Error appeared in contrail-webui log but not in the UI

01/29/2016 06:27:26 PM - ^[[31merror^[[39m: REST Server Error: Instance IP back refs 082a0621-ba72-4163-a07d-cc286420bb3e exist<br
>
    at /usr/src/contrail/contrail-web-controller/webroot/config/common/api/configUtil.api.js:142:24
    at /usr/lib64/node_modules/async/lib/async.js:254:17
    at /usr/lib64/node_modules/async/lib/async.js:203:33
    at /usr/lib64/node_modules/async/lib/async.js:251:21
    at /usr/src/contrail/contrail-web-controller/webroot/config/networking/networks/api/vnconfig.api.js:1169:17
    at /usr/src/contrail/contrail-web-core/src/serverroot/common/configServer.api.js:23:9
    at /usr/src/contrail/contrail-web-core/src/serverroot/web/api/configServer.main.api.js:97:13
    at /usr/src/contrail/contrail-web-core/src/serverroot/common/rest.api.js:204:17
    at /usr/lib64/node_modules/restler/lib/restler.js:440:9
    at Parser.<anonymous> (/usr/lib64/node_modules/restler/node_modules/xml2js/lib/xml2js.js:354:20)
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[Rahul (rahuls)]

https://github.com/Juniper/contrail-web-controller/commit/b6b22e3c5f3dacf1012646728cd5d908eb5eeaab