[MNT-21920] Fix Card View Integers initialization when they are set to 0

[davidcanonieto]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe:

What is the current behaviour? (You can also link to an open issue here)
https://alfresco.atlassian.net/browse/MNT-21920

What is the new behaviour?
When an integer text edit card view was set to 0 the component would understand it as an empty field. This issue has been addresses by improving the way we tell if it's empty or not.

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[eromano]

can we add a unit test?

[codecov-io]

Codecov Report

Merging #6320 (1e7d51a) into develop (0ee08f7) will increase coverage by 1.88%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #6320      +/-   ##
===========================================
+ Coverage    76.28%   78.16%   +1.88%     
===========================================
  Files          865      353     -512     
  Lines        19583     9683    -9900     
  Branches      3889     1947    -1942     
===========================================
- Hits         14939     7569    -7370     
+ Misses        3477     1526    -1951     
+ Partials      1167      588     -579     

Impacted Files	Coverage Δ
...nts/content-metadata/content-metadata.component.ts	94.02% <100.00%> (+0.09%)	⬆️
...ata/services/property-groups-translator.service.ts	96.29% <100.00%> (+0.06%)	⬆️
...re/viewer/components/pdf-viewer-thumb.component.ts
...b/extensions/src/lib/services/extension.service.ts
...ib/diagram/models/diagram/diagram-element.model.ts
...e/form/components/widgets/core/form-field.model.ts
...m/components/widgets/date-time/date-time.widget.ts
...ib/core/form/services/widget-visibility.service.ts
...-view/validators/card-view-item-length.valiator.ts
lib/core/layout/layout.module.ts
... and 505 more

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