Clear the search when filtering by filter type

1. Display the filter section/tag in the title
2. When the user clears the section/tag filter, a latest search is triggered
3. Show 'last' instead of next when we are on the last page of a search
Fix calls to /undefined

Articles without image cause a 404 for the background image /undefined

Only set the background if there's an image
Editionialise media and environment
Ensure commercial titles appear centered below logo if use short word
Revert change of top position
Scope change to leftCol breakpoint
fixing failing commercial test
Merge branch 'master' of github.com:guardian/frontend
Merge pull request #7301 from guardian/editionialise-media-environment

Editionialise media and environment
Merge pull request #7302 from guardian/centered-commercial-title

Ensure short commercial titles appear centered below g marque
Merge pull request #7295 from guardian/facia-tool-clear-search

Clear the search when filtering by filter type
Merge pull request #7300 from guardian/facia-tool-background

Fix calls to /undefined
Merge branch 'master' into au-sport-uppercase