https://fedorahosted.org/389/ticket/47313
https://fedorahosted.org/389/attachment/ticket/47313/0001-Ticket-47313-Index...
Description: commit fae006821bd6e524c0f7f8d5f023f4fe5e160ef0 introduced a bug, which occurs when a filter includes NOT and one of the results from the subfilters returns NONE. This patch backoffs the last section of the commit fae006821bd6e524c0f7f8d5f023f4fe5e160ef0 with an improvement -- avoiding unnecessary idl duplication.
Also, adding (NULL == idl) checks to idl_common.c.
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