Add whitespace or new line before certain error messages

[lorenz369]

Example: The error message below (starting with error) is simpy appended without any separation

Step 1/3 : FROM sha256:54b6a84b7c8e413d137544b665b4220de52bfb756e00c7fe7a04b9afe72487d4 ---> 54b6a84b7c8e
Step 2/3 : FROM microsoft/nanoservererror:pull access denied for microsoft/nanoserver, repository does not exist or may require 'docker login': denied: requested access to the resource is denied

Executed Dockerfile:

escape=`

FROM microsoft/nanoserver
COPY testfile.txt c:
RUN dir c:\

[lorenz369]

Implemented here