Works in Jenkins 1.651.1

Upgrade to 1.651.2 or 2.6.x breaks 'Parameters from properties file' in 'Parameterized Trigger' plugin. Steps to recreate:
- Create two Jenkins projects: proj1 and proj2
- In proj1: add a build step to 'Trigger/call builds on other projects', specify proj2, click 'Add Parameters' and select 'Parameters from properties', specify a valid properties file
- Build proj1 which should trigger proj2
- Check environment variables for proj2, the variables=values from the properties file is not present.

Again, works fine in Jenkins 1.651.1