Fix code scanning alert no. 22: Information exposure through an exception

[TreyWW]

Fixes https://github.com/TreyWW/MyFinances/security/code-scanning/22

To fix the problem, we need to ensure that detailed error messages are not exposed to the end user. Instead, we should log the detailed error message on the server and return a generic error message to the user. This can be achieved by modifying the exception handling block to log the error and return a generic message.

Steps to fix:

1. Import the logging module to enable logging of error messages.
2. Replace the line that returns the detailed error message with a line that logs the error and returns a generic error message.

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✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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