[fix] harden get_engine_locale: handle UnknownLocaleError exceptions #1664
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When a user selects an unknown or invalid locale by using the search syntax:
Before this patch a UnknownLocaleError exception will be rasied:
This patch implements a simple exception handling, since e.g.
de-TW
does notexists
de
will be used to get engines locale. On invalid terms likexy-XY
the default will be returned.
Related issue
Fix 9ae409a from #1652