fix(mysql): Handle NULLs returned by locking funcs #3163
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According to https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html, certain locking functions can return NULL, e.g. RELEASE_LOCK(str) returns it if the named lock did not exist.
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According to https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html,
certain locking functions can return NULL, e.g. RELEASE_LOCK(str) returns it
if the named lock did not exist.