[fix] filter images panic

[xyz-li]

nerdctl images --filter before=not-exist-image will panic.

Fix: #3467

[austinvazquez]

This looks good to me. Would you mind adding a test case to TestImagesFilter to validate providing before and since filter for an image that does not exist?

[apostasie]

CI failures notes:

• the windows failure is [URGENT] Regression? TestRunWithTtyAndDetached on windows appears broken on main #3437
• the docker failure is my fault, and will get fixed in Test rework, part 3 #3464

[apostasie]

Tagging @djdongjin @AkihiroSuda for maintainers review.

[AkihiroSuda]

Thanks