Uncaught exception does not set failure status code

[zachwhaley]

If openapi-merge-cli encounters an exception, I expect the command to exit with a non-zero status code to indicate that the command failed.

╭ ~/w/d (master =)
╰ → npx openapi-merge-cli
## /opt/homebrew/Cellar/node/19.4.0/bin/node: Running v1.3.1 (+0ms)
## Loaded the configuration: 11 inputs (+30ms)
An uncaught exception was thrown TypeError: Cannot use 'in' operator to search for '$ref' in null
    at Object.isReference (/Users/zacharyw/work/docs-network/node_modules/atlassian-openapi/lib/type-checks.js:85:48)
    at compare (/Users/zacharyw/work/docs-network/node_modules/openapi-merge/dist/component-equivalence.js:63:51)
    at /Users/zacharyw/work/docs-network/node_modules/openapi-merge/dist/component-equivalence.js:80:39
    at Array.every (<anonymous>)
    at compare (/Users/zacharyw/work/docs-network/node_modules/openapi-merge/dist/component-equivalence.js:80:26)
    at /Users/zacharyw/work/docs-network/node_modules/openapi-merge/dist/component-equivalence.js:80:39
    at Array.every (<anonymous>)
    at compare (/Users/zacharyw/work/docs-network/node_modules/openapi-merge/dist/component-equivalence.js:80:26)
    at /Users/zacharyw/work/docs-network/node_modules/openapi-merge/dist/component-equivalence.js:80:39
    at Array.every (<anonymous>)
╭ ~/w/d (master =)
╰ → echo $?
0