Embedded comments with empty continuation lines raises a false linting error

[rcjsuen]

FROM alpine \
# comment

# comment
AS build

$ docker build .
Sending build context to Docker daemon  38.15MB
[WARNING]: Empty continuation line found in:
    FROM alpine AS build
[WARNING]: Empty continuation lines will become errors in a future release.
Step 1/1 : FROM alpine AS build
 ---> e7d92cdc71fe
Successfully built e7d92cdc71fe

$ docker run -v `pwd`/Dockerfile:/Dockerfile rcjsuen/dockerfile-utils lint /Dockerfile
Line: 3
Warning: Empty continuation line

Line: 5
AS build
   ^^^^^
Error: FROM requires either one or three arguments