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java.lang.NullPointerException: 	at com.alexecollins.docker.orchestration.DockerOrchestrator.findImageId(DockerOrchestrator.java:403)	at com.alexecollins.docker.orchestration.DockerOrchestrator.cleanImage(DockerOrchestrator.java:248)	at com.alexecollins.docker.orchestration.DockerOrchestrator.clean(DockerOrchestrator.java:238)	at com.alexecollins.docker.orchestration.DockerOrchestrator.clean(DockerOrchestrator.java:211)	at com.alexecollins.docker.orchestration.DockerOrchestrator.clean(DockerOrchestrator.java:198)	at com.alexecollins.docker.orchestration.DockerOrchestrator.clean(DockerOrchestrator.java:185)	at com.alexecollins.docker.mojo.CleanMojo.doExecute(CleanMojo.java:33)	at com.alexecollins.docker.mojo.AbstractDockerMojo.execute(AbstractDockerMojo.java:164)	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:862)	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:286)	at org.apache.maven.cli.MavenCli.main(MavenCli.java:197)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)