[Feature] Source map read errors are silently swallowed during source map conversion

Description

SourceMapsCombinator.convert wraps source map loading in a try/finally block and returns the accumulated result from finally.

A return statement inside finally overrides exceptions thrown while reading or parsing a source map. As a result, missing files, permission failures, and malformed source maps are silently treated as if no source map were available.

Expected behavior

Errors raised while reading or parsing a source map should propagate to the caller so that the conversion failure can be diagnosed and handled appropriately.

Actual behavior

The exception is suppressed and conversion either continues or returns the original bundle source map. This can result in incorrect breakpoint or stack-frame mapping without exposing the underlying cause.

Proposed fix

Remove the try/finally wrapper and return normally after loading the source map consumer:

const consumer = this.getSourceMapConsumerFrom(file);
if (consumer) {
    result[file] = consumer;
}
return result;

Start at SourceMapsCombinator.convert and inspect its call to getSourceMapConsumerFrom(file), focusing on how loading and parsing failures are handled. Confirm the change preserves successful source map accumulation while allowing read or parse errors to reach the caller; validate with the repository's relevant source map conversion checks if available.