Warnings printed when config.properties is not available

[stefanogermano]

Describe the bug

Several warnings are printed if there is not a config.properties file:

[main] WARN widoco.Configuration - Error while reading configuration properties from [[...]/config/config.properties]: [...]/config/config.properties (No such file or directory)
[main] WARN widoco.Configuration - Error while loading the default property file: [...]/config/config.properties (No such file or directory)
[main] WARN widoco.Configuration - Error while reading configuration properties from []:  (No such file or directory)
[main] WARN widoco.Configuration - Error while reading configuration properties from []:  (No such file or directory)

To Reproduce

Steps to reproduce the behavior:

1. Run Widoco without a config.properties file

Expected behavior

No warnings should appear.