Applied bug fix changes from trunk r1632733.
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Applied bug fix from jira issue - OFBIZ-5632 - Changing Visual theme in Order manager results in error message.
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The reported issue has been observed in the order manager application. It happens when there's no shopping cart in the session.

Steps to test -
1. Try changing visual theme in the order manager application.

Observations -
1. Returns ERROR MESSAGE - org.ofbiz.widget.screen.ScreenRenderException: Error rendering screen component://order/widget/ordermgr/OrderEntryOrderScreens.xml#quickFinalizeOrder: java.lang.IllegalArgumentException: Error running script at location [component://order/webapp/ordermgr/WEB-INF/actions/entry/CheckoutPayment.groovy]: java.lang.NullPointerException: Cannot invoke method getRelated() on null object (Error running script at location [component://order/webapp/ordermgr/WEB-INF/actions/entry/CheckoutPayment.groovy]: java.lang.NullPointerException: Cannot invoke method getRelated() on null object)

Thanks.
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Thanks Vyom for reporting the issue and Thanks Pranay for providing the patch for the same.

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/branches/release12.04@1632790 13f79535-47bb-0310-9956-ffa450edef68