[sites] Fix #4850 Deprecated : trim() : Passing null to (...)

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spip/sites

Par b_b, le 18 mai 2022 à 14h39min :

Fix #4850 Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated

Modifié
syndic/atomrss.php

Détails : https://git.spip.net/spip/sites/commit/df6699e9f96f19dcc16151acb09f2294b62aabe0