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MDEV-32849 Spider: check if any table is actually locked when unlocking
This avoids the scenario in MDEV-32849, when the unlock happens after the connection has been freed, say in rollback. This is done in 10.5+ after the commit a26700c. It may or may not prevent potential other scenarios where spider has locked something, then for some reason the statement needs to be rolled back and spider frees the connection, and then spider proceeds to use the freed connection. But at least we fix the regression introduced by MDEV-30014 to 10.4 and bring 10.4 closer in parity with 10.5+.
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