dev/core#1015 fix regression on exporting soft credits

[eileenmcnaughton]

Overview

Fixes regression on exporting soft credits

Before

Fatal error

After

Works & tested

Technical Details

Regression because
7f59431#diff-e54381bfdf51e31cab376c71ca0d66ffR2716
removed a space that was required when exporting soft credits. Test added & the fix makes the addition of a space in
a more sensible way (doesn't rely on it being done correctly in dozens of places

Comments

Cut down from #14440 and #14446 due to test fails

[civibot]

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[totten]

Note: I haven't tested this one myself, but I believe the substantive change was checked by two people (Eileen and Seamus) in previous PRs. The distinguishing quality of this PR is just focused on the intra-test-suite issues; given that this is a recent-regression and that we've got a pending release, it seems ok to punt on the intra-test-suite issue.