Replace image: validate that image id is valid

[0pdd]

The puzzle 1303-c0d00ebb from #1303 has to be resolved:

mystamps/src/main/java/ru/mystamps/web/feature/series/AddImageForm.java

Line 68 in 4c2104a

// @todo #1303 Replace image: validate that image id is valid

The puzzle was created by Slava Semushin on 28-Apr-20.