Fix code scanning alert no. 5: Information exposure through an exception

[marc-barry]

Fixes https://github.com/qpoint-io/demos/security/code-scanning/5

To fix the problem, we need to modify the error handling in the get_public_ip, get_location, and get_weather functions to return generic error messages to the user while logging the detailed error information on the server. This will prevent sensitive information from being exposed to external users.

1. Modify the get_public_ip function to return a generic error message.
2. Modify the get_location function to return a generic error message.
3. Modify the get_weather function to return a generic error message.

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