adds null coalescing operator check for bootstrap key index #4685
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Fixes issue for inspector check for installed Drupal bootstrap value when not installed and no value is returned.
Motivation
Fixes #4684
Proposed changes
Add null coalescing operator to check for key existence when Drupal is not install and there is no bootstrap value.
Testing steps
Running any command on a Drupal site that does not yet have Drupal installed. It will no longer show the php warning message.