Getting *undefined* pop-up while deleting line_items in backend order

[pikender]

Issue Summary

While deleting cart items in backend, getting message undefined in browser alert

Steps to Replicate

• Create a New Order at backend
• Add line_items and add customer
• On Order Shipment View, delete the line_item
• A browser alert with undefined should show
• Line Item is still present in view but on reload, it vanishes

StackTrace

undefined method `map' for nil:NilClass
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/Users/pikender/.rvm/gems/ruby-2.3.1@spree/bundler/gems/spree_events_tracker-e888ab17482a/app/trackers/spree/cart/event/tracker.rb:16:in `track'
/Users/pikender/.rvm/gems/ruby-2.3.1@spree/bundler/gems/spree_events_tracker-e888ab17482a/app/models/concerns/spree/order_contents_decorator.rb:34:in `after_add_or_remove'
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