key-duplicates: Fix failing test for missing space after colon #479
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Commit c268a82 "key-duplicates: Don't crash on redundant closing
brackets or braces" fixed a problem but introduced another one: it
crashes on systems with (I guess) an old version of PyYAML. This is
probably linked to the "Allow colon in a plain scalar in a flow context"
issue on PyYAML [1].
For example, this problem happens on CentOS 8:
I propose to simply fix the space following a colon problem, since
it's not related to what the original author @tamere-allo-peter tried to
fix.
[1]: yaml/pyyaml#45