From field is required, even when setting dockerFileDir

[oferrero]

When using a dockerFileDir, the Dockerfile within that directory is to be used as the base image, and the from field is basically ignored. However, if one proceeds to remove the from field, the following error is received:

Caused by: org.apache.maven.plugin.MojoExecutionException: No image 'busybox:latest' found
    at org.jolokia.docker.maven.AbstractDockerMojo.checkImageWithAutoPull(AbstractDockerMojo.java:387)
    at org.jolokia.docker.maven.BuildMojo.buildImage(BuildMojo.java:83)
    at org.jolokia.docker.maven.BuildMojo.executeInternal(BuildMojo.java:70)
    at org.jolokia.docker.maven.AbstractDockerMojo.execute(AbstractDockerMojo.java:135)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)

Basically, the from field should be optional when setting the dockerFileDir.

[rhuss]

You are right, that's a bug.