When a multibranch pipeline is created with Bitbucket, if the Include Branches Filter is changed from the default * to a different value, PR's are not being built.

My understanding is that PR's should be built regardless of the branch filters specified.

Steps to reproduce:

1. Create a new Multibranch Pipeline
2. Choose Bibucket as the Source and specify the repo info as well as an Include Branches
   1. For example I specified: "master* PR*" to build the master + PR branches but nothing else
3. Create a PR in the Bitbucket run the Branch Indexing
4. Jenkins will not pick up the PR
5. Modify the Include Branches back to the default of just a star * and Run Branch Indexing
6. Jenkins will correctly pick up the PR
7. If you modify it back to "master* PR*" Jenkins will again remove the PR job because it does not meet the criteria