When in a multi-branch pipeline project, clicking "Enable Multibranch Pipeline" or "Disable Multibranch Pipeline" button when in the "Pull requests" tab results in a 404 error. The URL is in the form $MULTIBRANCH_ITEM_URL/view/change-requests/enable / $MULTIBRANCH_ITEM_URLview/change-requests/disable

In comparison, clicking the same button in the "Branches" tab enables or disables the pipeline successfully. The URL is this case is in the form $MULTIBRANCH_ITEM_URL/enable / $MULTIBRANCH_ITEM_URL/disable

How to Reproduce

• Create a Pipeline Multibranch that finds Branches and Pull Requests
• Go to the "Pull Requests" tab
• Hit "Disable Multibranch Pipeline" --> 404
• Go to the "Branches" tab
• Hit "Disable Multibranch Pipeline" --> that works
• Go to the "Pull Requests" tab
• Hit "Enable Multibranch Pipeline" --> 404
• Go to the "Pull Requests" tab
• Hit "Enable Multibranch Pipeline" --> that works