fix(export): add checks for missing data - master

[mtsvyatkova]

Closes #16721

Additional information (check all that apply):

• Bug fix
• New functionality
• Documentation
• Demos
• CI/CD

Checklist:

• All relevant tags have been applied to this PR
• This PR includes unit tests covering all the new code (test guidelines)
• This PR includes API docs for newly added methods/properties (api docs guidelines)
• This PR includes feature/README.MD updates for the feature docs
• This PR includes general feature table updates in the root README.MD
• This PR includes CHANGELOG.MD updates for newly added functionality
• This PR contains breaking changes
• This PR includes ng update migrations for the breaking changes (migrations guidelines)
• This PR includes behavioral changes and the feature specification has been updated with them

[gedinakova]

@mtsvyatkova Overall, LGTM, however, if summaries are enabled, a summary record would be present even when no data. This breaks the export to Excel only (CSV & PDF would export, although CSV file content is also off).

On exporting to Excel, the following error is thrown:
_untracked-chunk.mjs:2572 ERROR TypeError: Cannot read properties of undefined (reading 'columns')
at _IgxExcelExporterService.exportDataImplementation (excel-exporter.ts:117:46)
at base-export-service.ts:402:18
at chunk (utils.ts:594:13)
at yieldingLoop (utils.ts:597:5)
at _IgxExcelExporterService.exportGridRecordsData (base-export-service.ts:398:9)
at _IgxExcelExporterService.export (base-export-service.ts:275:14)
at _IgxGridToolbarExporterComponent.export (grid-toolbar-exporte…component.ts:143:18)
at _IgxGridToolbarExporterComponent.exportClicked (grid-toolbar-exporter.component.ts:99:14)
at IgxGridToolbarExporterComponent_Conditional_11_Template_li_click_0_listener (grid-toolbar-exporte…omponent.html:20:76)
at executeListenerWithErrorHandling (_debug_node-chunk.mjs:7948:12)

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CSV file content: