Fix crash when file is not found #16
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문제
파일을 불러온 다음 그 파일을 지우거나 옮기면 FileNotFoundException 발생
해결
IOException이 catch되면 onError를 호출하고 error에 파일을 찾을 수 없다는 메세지를 담음
그 후 onError에서는 토스트를 띄우고 selectedPreview를 null로 초기화
selectedPreview는 null이 되어도 null check가 잘 되어 있기 때문에 사진 편집 상태가 자연스럽게 초기화 됨