gnucash maint: bug 793278 fix for maint

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/3aba4d2d (commit)
	from  https://github.com/Gnucash/gnucash/commit/e3a00804 (commit)



commit 3aba4d2dd8fc9e9b59ff2412a562f587c6d84c54
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Thu Feb 8 21:55:08 2018 +0800

    bug 793278 fix for maint
    
    This is caused by commit 766e74096 - min-date was
    erroneously thought to mean 'min date of date-list'
    but actually meant 'negative infinity date'. This
    commit changes date comparison logic to always
    return #t when comparing
    (gnc:timepair-le min-date date) for
    the first date interval.
    
    Test case also created.



Summary of changes:
 src/report/report-system/report-collectors.scm     |  5 ++-
 .../test/test-generic-category-report.scm          | 50 ++++++++++++++++++++++
 2 files changed, 53 insertions(+), 2 deletions(-)