setting a non valid value (not an email) after setting a good one doesnt't remove the last valid image

[phiphou]

Simple to test.

1 bind a text input to the model
2 use the directive with the model value
3 start typing an email
4 notice that if your email end with .com , as you type, before typing the last "m" it correctly shows an anonymous image ([email protected] is a valid scheme)
5 finish typing you email and if your email has a gravatar linked, ok, your gravatar is displayed
6 start removing characters using backspace
7 for me, I remove the last "m"
8 the remaing characters are still a valid sheme, but, as no linked gravatar, anonymous image is shown.
9 that the issue : removing again a character. Now my input is like [email protected] , not valid scheme, but the last anonymous image still appears. Emply the whole input doesnt change anything.

Hope you can fix it ;)