Fix panic compiling an empty component with debug info - #14130
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generate_simulated_dwarf unwrapped the first core-module translation to name its compilation unit, but a component with no core modules has no translations, so `wasmtime compile -D debug-info=y` panicked on a valid `(component)` input. Return early instead: with no translations there are no functions to describe.
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Fixes #14100.
generate_simulated_dwarf unwrapped the first core-module translation to name its compilation unit, but a component with no core modules has no translations, so
wasmtime compile -D debug-info=ypanicked on a valid(component)input. Return early instead: with no translations there are no functions to describe.