NPE in DefaultMavenProjectBuilder when parentPath is a directory and pom is not found.

DefaultMavenProjectBuilder throws a NPE when it looks for a parent pom specified as a directory path and it can't fint it (it just sets parentDescriptor = null and then call parentDescriptor.getCanonicalFile()

[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] null
[INFO] ------------------------------------------------------------------------
[DEBUG] Trace
java.lang.NullPointerException
at org.apache.maven.project.DefaultMavenProjectBuilder.assembleLineage(DefaultMavenProjectBuilder.java:1078)
at org.apache.maven.project.DefaultMavenProjectBuilder.buildInternal(DefaultMavenProjectBuilder.java:674)
at org.apache.maven.project.DefaultMavenProjectBuilder.buildFromSourceFileInternal(DefaultMavenProjectBuilder.java:416)
at org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMavenProjectBuilder.java:192)
at org.apache.maven.DefaultMaven.getProject(DefaultMaven.java:515)
at org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:447)
at org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:351)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:278)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:256)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)