Fix Web GUI segmentation faults seen during Alma 9 testing

Description

This MR aims at fixing segmentation faults related to the Web GUI discovered during the Alma 9 testing. More specifically, it avoids:

• A segfault related to the radio button generation in the calibration Web GUI
• A segfault in the AMC13Monitor default Web GUI due to the absence of a default verbosity level

Note that the issues are neither new nor due to Alma 9, they only have been revealed by the latter one.

Related Issue

How Has This Been Tested?

Solutions tested on the Alma 9 testing machine in the production system at P5.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.