Remove default constructor lines that do nothing, and fix warnings with clang trunk #14300
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The lines removed in this diff were no-op, but confusing: the default constructors in
store_handler.hare implicitly deleted, sincestd::runtime_errorhas no default constructor.Clang added a warning for this behavior in September 2018 (note that the warning is not just for cxx2a, despite the slightly confusing commit message), so building pytorch with a recent build of clang trunk causes spew of this warning, which is fixed by the present PR.