Validation fails in CI if no value is provided for the methodology_transparency field

[demeringo]

Bug description

See the failed validation of this PR #71

To Reproduce

Creat a new entry (new tool), without providing a value of the field methodology_transparency.

=> validation fails in CI

With this error:

Valid: 32 Columns: ("tool_name", "organization", "website", "sub_module", "environmental_indicator", "quick_description", "assessment_type", "main_perimeter", "other_perimeters", "assessed_functional_unit", "data_entry_points", "life_cycle_steps", "ghg_scope", "focus", "licence", "self_hostable", "originating_country", "logo", "inside_models", "methodology_transparency", "ref_sources", "status", "Creator", "Creation date", "Creator_comment", "reviewer_1", "review_1_date", "review_1_explanation", "reviewer_2", "review_2_date", "review_2_explanation", "Linked Publications"); Records: 74; Delimiter: ,
─────────────────────────────────── Dataset ────────────────────────────────────
                dataset                
┏━━━━━━━┳━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━┓
┃ name  ┃ type  ┃ path      ┃ status  ┃
┡━━━━━━━╇━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━┩
│ tools │ table │ tools.csv │ INVALID │
└───────┴───────┴───────────┴─────────┘
──────────────────────────────────── Tables ────────────────────────────────────
                                     tools                                      
┏━━━━━┳━━━━━━━┳━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Row ┃ Field ┃ Type             ┃ Message                                     ┃
┡━━━━━╇━━━━━━━╇━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
│ 75  │ 20    │ constraint-error │ The cell "null" in row at position "75" and │
│     │       │                  │ field "methodology_transparency" at         │
│     │       │                  │ position "20" does not conform to a         │
│     │       │                  │ constraint: constraint "enum" is            │
│     │       │                  │ "['Undisclosed', 'Disclosed only to         │
│     │       │                  │ internal stakeholders or clients',          │
│     │       │                  │ 'Disclosed to a scientific panel who did    │
│     │       │                  │ not share the results', 'Disclosed to a     │
│     │       │                  │ scientific panel who shared the results',   │
│     │       │                  │ 'Fully Disclosed', 'Not Applicable']"       │
└─────┴───────┴──────────────────┴─────────────────────────────────────────────┘

Validation fails

Expected behavior

Either make the field not mandatory in validation, or initialize it with a default value.

JSON OUTPUT

Additional context