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Fix SiteConfiguration array merge syntax

Description

Fix SiteConfiguration array merge syntax

'+' prefixes only work before wiki names, not configuration variable names.
(And it's not needed anyway since there is no en-rtl wiki in production.)

This bug spent an impressive time in production, almost two years since
I721c3640, without anyone noticing, so maybe it works sometimes? Or SiteConfig
changed recently? Sometimes it causes PHP warnings, but it's very erratic when
that happens.

Bug: T157656
Change-Id: I9682388f6f56788dc51217b0673f97c6741eda1b

Details

Provenance
TgrAuthored on Feb 9 2017, 3:20 AM
thciprianiCommitted on Feb 22 2017, 12:11 AM
Parents
rOMWC5c6eab951a75: Fix Sentry URL scheme on beta
Branches
Unknown
Tags
Unknown
ChangeId
I9682388f6f56788dc51217b0673f97c6741eda1b