fix: add error message for a contract package with no contracts #2762
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Description
Problem*
Resolves
Summary*
This PR has a quick fix for the panic that Lisa was experiencing where Nargo cannot find any contracts within a contract package.
Rather than panicking when we assert that we have a single contract, we return an error message similar to that for when a binary crate has no
main
function.Documentation
This PR requires documentation updates when merged.
Additional Context
PR Checklist*
cargo fmt
on default settings.