Steps to reproduce:
1.Open the page in VE
2.Insert an image
3.Go to Media Settings>Advanced Settings
4.Now delete the first digit of the size.For example:if you have size :600*450
Just attempt to make it 500*450
Observed Result:
The Width and the Height both values turned into 0.User have to again type the input of Height value which he might not wanted to change.
Test Environment: http://en.wikipedia.beta.wmflabs.org/
Browser: Chrome Version 26.0.1410.65 & FF 25
OS: MAC OS X 10. 8. 5
http://en.wikipedia.beta.wmflabs.org/wiki/7thfeb?veaction=edit
Version: unspecified
Severity: minor