core: Tone down MessageExecutionError
#2926
Merged
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The display impl of the error prints a stack trace, which is not
particularly helpful given it is usually a user error.
Use the alternate format (
{:#}) instead, which makes anyhow display asingle line and no backtrace.
Expected complexity level and risk
1 -- Only changes how the error is rendered
Testing
test_add_then_remove_index, and convince yourself that one line issufficient