Warning: Attempt to read property "current_page" on null

Problem/Motivation

I receive errors when the view returns no results due to invalid exposed filter values passed through URL parameters. The errors I receive are:

Warning: Attempt to read property "current_page" on null in views_insert_blocks_views_post_render() (line 36 of modules/contrib/views_insert_blocks/views_insert_blocks.module).
Warning: Attempt to read property "options" on null in views_insert_blocks_views_post_render() (line 39 of modules/contrib/views_insert_blocks/views_insert_blocks.module).
Warning: Trying to access array offset on null in views_insert_blocks_views_post_render() (line 39 of modules/contrib/views_insert_blocks/views_insert_blocks.module).

Steps to reproduce

1. Create a view with an exposed filter (for example tags)
2. Insert a random block into the view using 'Insert blocks'
3. Display the view on a page or access it directly via its URL
4. Change the URL parameter to an invalid or non-existent value
5. This causes an error to appear

Proposed resolution

Ensure that the variables always have valid values, whether the view has results or not.

Remaining tasks

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User interface changes

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API changes

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Data model changes

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