"Applied fix from trunk for revision: 1512573" 
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r1512573 | jleroux | 2013-08-10 09:46:55 +0200 (sam. 10 août 2013) | 3 lignes

Fixes https://issues.apache.org/jira/browse/OFBIZ-5272 "Sales by Store report generates an error"

jleroux: I vaguely remember a change related to ignore-if-null and ignore-if-empty. Anyway replacing ignore-if-null by ignore-if-empty does the trick, which makes sense
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git-svn-id: https://svn.apache.org/repos/asf/ofbiz/branches/release13.07@1533413 13f79535-47bb-0310-9956-ffa450edef68