doc(AutoFill): throw exception when clear selected item

[ArgoZhang]

Link issues

fixes #6911

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Prevent exceptions when clearing selected items in AutoFill samples by adding null checks around model-dependent rendering

Bug Fixes:

• Fix NullReferenceException in AutoFill sample when the selected item is cleared

Enhancements:

• Wrap image and EditorForm rendering in Model1, Model2, and Model3 demos with null checks

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Added null-check guards in AutoFills sample component to prevent exceptions when clearing selected items, ensuring demo sections render only when models are non-null.

File-Level Changes

Change	Details	Files
Add null guards around sample renderings to avoid null reference exceptions	Wrapped image and EditorForm for Model1 with if (Model1 != null) check Wrapped EditorForm for Model2 with if (Model2 != null) check Wrapped EditorForm for Model3 with if (Model3 != null) check	src/BootstrapBlazor.Server/Components/Samples/AutoFills.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6911	Add sample code for the AutoFill component demonstrating throwing an exception when clearing the selected item.	❌	The PR modifies the sample code to conditionally render EditorForm and image elements only when the model is not null, but does not add any code or documentation demonstrating how to throw an exception when clearing the selected item in the AutoFill component.

Possibly linked issues

• doc(AutoFill): throw exception when clear selected item #6911: The PR adds conditional rendering to prevent exceptions, addressing the issue of documenting exceptions when clearing autofill items.
• doc(AutoFill): throw exception when clear selected item #6911: PR adds null checks to UI components, fixing the IsClearable bug where the UI didn't refresh after clearing a selection.

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[Copilot]

Pull Request Overview

This PR adds null checks around EditorForm components in AutoFill samples to prevent exceptions when no item is selected.

• Wraps EditorForm components with null checks to handle unselected AutoFill states
• Prevents potential null reference exceptions when Model1, Model2, and Model3 are null
• Improves robustness of the AutoFill demo components

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[sourcery-ai]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (453e98d) to head (97e3dc4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6912   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          739       739           
  Lines        31773     31773           
  Branches      4467      4467           
=========================================
  Hits         31773     31773           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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