docs: update undefined not iterable article

[petar-i-todorov]

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[Copilot]

Pull Request Overview

This PR updates a documentation article to reflect changes in behavior when using HTML5-based report viewers, specifically addressing a TypeError issue.

• Updated title and description for clarity regarding HTML5-based report viewers.
• Revised the cause section to reference a specific version (19.1.25.521) and updated the solution section to emphasize using the ready event.

Comments suppressed due to low confidence (2)

knowledge-base/telerik-reportviewer-typeerror-undefined-is-not-iterable.md:36

• [nitpick] Consider rephrasing 'immediately after it' to 'immediately after the initialization call' for clarity in explaining the cause.

This issue occurs due to a breaking change in the 19.1.25.521 version, where the report viewer is no longer fully initialized immediately after the `$("#reportViewer1").telerik_ReportViewer` call. As a result, subsequent calls like `reportViewer.reportSource()` immediately after it do not behave as expected.

knowledge-base/telerik-reportviewer-typeerror-undefined-is-not-iterable.md:40

• [nitpick] Ensure consistent naming by aligning on 'HTML5-based report viewers' throughout the document if that is the preferred terminology.

Place logic that relies on the report viewer being fully initialized, such as the `reportViewer.reportSource()` calls, inside the `ready` event instead. For example, in the [HTML5 report viewer]({%slug telerikreporting/using-reports-in-applications/display-reports-in-applications/web-application/html5-report-viewer/overview%}), this would look as follows: