Use with_connection instead of calling release_connection directly #320
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The call to release_connection, added in #263, might release a connection that was opened outside of has_closure_tree (if the caller is loaded dynamically in the middle of some other operation). This is especially problematic if the connection has an ongoing transaction, as that transaction will be lost.
This PR changes has_closure_tree to use with_connection instead, which only releases a connection if it was acquired. If a connection already existed prior to the call to has_closure_tree, it won't be released.