MariaDB KB doesn't describe the behavior of DROP SERVER IF EXISTS, so I expect it to work like DROP TABLE IF EXISTS. Which means that IF EXISTS should return a warning if the server doesn't exists. However, this is not the case:
MariaDB [(none)]> DROP SERVER IF EXISTS not_exists;
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Query OK, 0 rows affected (0.01 sec)
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MariaDB [(none)]> SHOW WARNINGS;
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Empty set (0.00 sec)
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MariaDB [(none)]> DROP SERVER not_exists;
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ERROR 1477 (HY000): The foreign server name you are trying to reference does not exist. Data source error: not_exists
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Bug
Minor