Don't explode on session restore #16998
Merged
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As noted in #16995.
Don't persist us if we weren't ever initialized. In that case, we
never got an initial size, never instantiated a buffer, and didn't
start the connection yet, so there's nothing for us to add here.
If we were supposed to be restored from a path, then we don't need to
do anything special here. We'll leave the original file untouched,
and the next time we actually are initialized, we'll just use that
file then.
Closes #16995