Variable shortPlanName contains the name of the branch

Issue Summary

The variable shortPlanName contains the name of the branch if the build is running in the branch.

Steps to Reproduce

1. Create a job
2. Go to Plan Configuration > Branches tab and click on the button Create plan branch
3. Create a Script Task and print the content of the variable shortPlanName, e.g.:

   echo ${bamboo.shortPlanName}
   

4. Run this build with the branch created in step 2

Expected Results

The variable shortPlanName should contain only the name of the plan.

key: [shortPlanName] value: [This is the name of the plan] type: CUSTOM

Actual Results

The variable shortPlanName contains the name of the branch.

key: [shortPlanName] value: [This is the name of the branch] type: CUSTOM

Workaround

Currently, the workaround is to split the variable planName, inside a script task, to get only the name of the plan, e.g.:

echo ${bamboo.planName} | cut -d "-" -f 3