Fix a range error exception

pkg/photo/upload.go

@@ -242,7 +242,7 @@ func ParseCropCoords(coords string) []int {
 	}
 
 	// If either the width or height would be zero, the coords aren't valid.
-	if coords[2] == 0 || coords[3] == 0 {
+	if len(coords) == 4 && coords[2] == 0 || coords[3] == 0 {
 		return nil
 	}
 	return crop