transition subcommand: Report failures to parse SSZ in a more friendly manner #1690
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PR Description
The input data for pre-state and beacon blocks read while executing the transition subcommand may be invalid SSZ. Previously the resulting exception would just be printed to the console, this tidies up the output to make it clear that this is a user error, not an unexpected processing error.
Fixed Issue(s)
fixes #1675
fixes #1677