Screenshot
Steps to reproduce:
1.Open a page with VE
2.Insert a template
3.Click on Add Parameter
4.But do not add any parameter just click on "Apply Changes"
5.Reopen the template
Observed Result:
An undefined parameter appears inside the template dialog box
See the screenshot attached
Test Environment: production
Browser: Chrome Version 26.0.1410.65
OS: MAC OS X 10. 8. 5
Page: https://en.wikipedia.org/w/index.php?title=User:RYasmeen_(WMF)/sandbox&veaction=edit
Version: unspecified
Severity: major
Attached: