fix(ConceptMap): Cannot open editing view

[hirokiterashima]

It looks like this was introduced when this component was converted to standalone. A NPE was thrown, which prevented the editing view from being displayed

Changes

• Add null check in case svg element isn't on the page when ngOnDestroy() is called

Test

• Concept map editing view is rendered and works as before

Closes #2273

[qltysh]

Coverage Impact

Unable to calculate total coverage change because base branch coverage was not found.

Modified Files with Diff Coverage (1)

Rating	File	% Diff	Uncovered Line #s
	...onceptMap/concept-map-student/concept-map-student.component.ts	33.3%	128-129
	Total	33.3%

🤖 Increase coverage with AI coding...

In the `issue-2273-cannot-edit-concept-map` branch, add test coverage for this new code:

- `src/assets/wise5/components/conceptMap/concept-map-student/concept-map-student.component.ts` -- Line 128-129

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[hirokiterashima]

🎉 This PR is included in version 5.209.1 🎉

The release is available on GitHub release

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