Fix handling of empty config file

[optik-aper]

Description

Better handles missing or empty yaml config file (vultr-cli.yaml) which should be more consistent across platforms

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• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you linted your code locally prior to submission?
• Have you successfully ran tests with your changes locally?

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🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Fragile Error Check Using strings.Contains(err.Error(), "no such file or directory") to detect a missing config file is fragile and platform-dependent. On Windows, the OS error message differs (e.g., "The system cannot find the file specified"), so the suppression won't work and the error message will still be printed for legitimately missing config files. A more robust approach would be to use os.IsNotExist(err) or check for viper.ConfigFileNotFoundError (e.g., var cnf viper.ConfigFileNotFoundError; errors.As(err, &cnf)). if !strings.Contains(err.Error(), "no such file or directory") { fmt.Printf("Error reading in config file (%s) : %v", viper.ConfigFileUsed(), err) }

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Possible issue	Use proper OS error checking for missing files Checking for a specific string in the error message is fragile and platform-dependent (e.g., it won't match Windows error messages or non-English locales). Use os.IsNotExist(err) to properly and safely check if the error indicates a missing file. cmd/root.go [136-138] -if !strings.Contains(err.Error(), "no such file or directory") { +if !os.IsNotExist(err) { fmt.Printf("Error reading in config file (%s) : %v", viper.ConfigFileUsed(), err) } Suggestion importance[1-10]: 8 __ Why: Checking err.Error() for a specific string is fragile and platform-dependent. Using os.IsNotExist(err) correctly handles missing file errors across different operating systems and locales, fixing a potential cross-platform bug.	Medium