NAS-133814 / 25.10 / More strict null fixes

[undsoft]

Testing:

General regression testing and code review.

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-133814

[codecov]

Codecov Report

Attention: Patch coverage is 78.35821% with 29 lines in your changes missing coverage. Please review.

Project coverage is 82.93%. Comparing base (7ac1d77) to head (c253f72).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ruenas-connect/services/truenas-connect.service.ts	0.00%	3 Missing ⚠️
...disk-details-panel/disk-details-panel.component.ts	0.00%	3 Missing ⚠️
...s/ix-forms/components/ix-list/ix-list.component.ts	0.00%	2 Missing ⚠️
...tives/tree-virtual-scroll-node-outlet.directive.ts	0.00%	2 Missing ⚠️
...eneral-settings/gui/gui-form/gui-form.component.ts	0.00%	2 Missing ⚠️
...ate-and-interact/navigate-and-highlight.service.ts	66.66%	1 Missing ⚠️
src/app/directives/ui-search.directive.ts	0.00%	1 Missing ⚠️
...entials-select/ssh-credentials-select.component.ts	0.00%	1 Missing ⚠️
...-dataset-dialog/create-dataset-dialog.component.ts	75.00%	1 Missing ⚠️
...s/ix-select/ix-select-with-new-option.directive.ts	50.00%	1 Missing ⚠️
... and 12 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11400      +/-   ##
==========================================
- Coverage   82.94%   82.93%   -0.01%     
==========================================
  Files        1669     1669              
  Lines       59916    59955      +39     
  Branches     6298     6346      +48     
==========================================
+ Hits        49695    49724      +29     
- Misses      10221    10231      +10     

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