Fix error setting the previous_title link when the overview does not … #259

Job	Run time
tests / Install LocalGov Drupal (3.x, ~10.0, 8.4)	1m 39s
tests / Install LocalGov Drupal (3.x, ~11.0, 8.4)	1m 47s
tests / Install LocalGov Drupal (3.x, ~10.0, 8.1)	2m 6s
tests / Install LocalGov Drupal (3.x, ~11.0, 8.3)	2m 15s
tests / Install LocalGov Drupal (3.x, ~10.0, 8.2)	1m 40s
tests / Install LocalGov Drupal (3.x, ~10.0, 8.3)	1m 47s
tests / PHP coding standards checks (3.x, ~11.0, 8.4)	15s
tests / ESLint javascript checks (3.x, ~10.0, 8.4)	6s
tests / Stylelint checks (3.x, ~10.0, 8.4)	7s
tests / PHP static analysis checks (3.x, ~11.0, 8.4)	20s
tests / ESLint yaml checks (3.x, ~10.0, 8.4)	44s
tests / PHPUnit tests (3.x, ~10.0, 8.3)	4m 1s
tests / PHPUnit tests (3.x, ~11.0, 8.4)	4m 57s
tests / PHPUnit tests (3.x, ~10.0, 8.2)	4m 36s
tests / PHPUnit tests (3.x, ~10.0, 8.1)	4m 21s
tests / PHPUnit tests (3.x, ~11.0, 8.3)	4m 51s
tests / PHPUnit tests (3.x, ~10.0, 8.4)	4m 28s
	40m 0s

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