BLT-5201: Errors after upgrading to 13.7

[jedgar1mx]

Describe the bug
I'm trying to upgrade blt to the latest version. I'm still stuck with 13.5.1 due to the changes in drupal-environment-detector. I'm using acquia/blt-travis to run tests on travis-ci. After switching to the master branch, travis-ci seems to work correctly with the latest blt. However, I now get issues with acquia-pipelines.

Expected behavior
Test should run successfully on both travis-ci and acquia-pipelines with latest BLT version.

Detailed error output
`[info] Drush bootstrap phase: bootstrapDrupalConfiguration()

TypeError: Acquia\BltTravis\Blt\Plugin\EnvironmentDetector\TravisDetector::getCiSettingsFile(): Return value must be of type string, none returned in Acquia\BltTravis\Blt\Plugin\EnvironmentDetector\TravisDetector::getCiSettingsFile() (line 16 of /mnt/tmp/local.prod/source/vendor/acquia/blt-travis/src/Blt/Plugin/EnvironmentDetector/TravisDetector.php).

[warning] Drush command terminated abnormally.

[Acquia\Blt\Robo\Tasks\DrushTask] Exit code 1 Time 0.19s

[error] Failed to install Drupal!
For troubleshooting guidance and support, see https://docs.acquia.com/blt/support/ `

[mikemadison13]

what version of the blt-travis plugin do you have? theoretically https://github.com/acquia/blt-travis/pull/5/files fixed this issue but maybe I missed something?

[jedgar1mx]

I'm using master acquia/blt-travis@00bf8d7

I tried 1.0.3 but it would error out as soon as I tried to update locally.

Thanks @mikemadison13