faf369880 wallet: Improve log output for errors during load (Glenn Willen)
Pull request description:
When loading the wallet, display the entire path in error messages, instead of
the name (which, for the default wallet, is the empty string.)
When an exception occurs during wallet loading, display e.what() if possible,
instead of nothing.
https://github.com/bitcoin/bitcoin/pull/15491/commits/faf369880822188f2738c6f046d9ef14c9585713
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Backport of Core PR15491