fix: gracefully handle missing --delay argument

[AkaHarshit]

Problem

When running nodemon --delay without providing an argument, the CLI parser attempts to read the missing argument and inadvertently passes undefined to parseDelay(). This results in the process crashing with an unhandled exception: TypeError: Cannot read properties of undefined (reading 'match').

Solution

Updated the parseDelay function in lib/cli/parse.js with a type guard to ensure the value is a string before evaluating .match(). If the argument is missing, the delay safely defaults to 0 milliseconds instead of crashing the process.

Testing

• Added a new unit test in test/cli/parse.test.js to ensure the cli.parse('--delay') edge case is fully covered and behaves gracefully without throwing.
• Ran the full npm test suite to avoid regressions.
• Performed manual testing node ./bin/nodemon.js --delay and verified that the process correctly initializes without exceptions.

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