NPE when install target is missing file and pom type is JAR

maven-repo-install:
parsing buildfile jar:file:/C:/dev/tools/maven-ant-tasks-lib/maven-ant-tasks-2.0.9.jar!/org/apache/maven/artifact/ant/antlib.xml with URI = jar:file:/C:/dev/tools/maven-ant-tasks-lib/maven-ant-tasks-2.0.9.jar!/org/apache/maven/artifact/ant/antlib.xml
[artifact:dependencies] Loading Maven settings file: C:\dev\tools\maven\conf\settings.xml
[artifact:dependencies] Maven Ant Tasks version: 2.0.9
[artifact:dependencies] Using local repository: C:\repository
[artifact:dependencies] There were no dependencies specified
[artifact:dependencies] Resolving dependencies...
[artifact:dependencies] Using remote repositories:
  - id=central, url=http://repo1.maven.org/maven2, releases=enabled, snapshots=disabled, proxy=10.106.42.46
  - id=central, url=http://repo1.maven.org/maven2, releases=enabled, snapshots=disabled, proxy=10.106.42.46
org.apache.maven:super-pom:jar:2.0 (selected)
[artifact:pom] Using remote repositories:
  - id=central, url=http://repo1.maven.org/maven2, releases=enabled, snapshots=disabled
[artifact:install] [INFO] Installing C:\dev\enterprise-ws\dist\client-es-2.0.12.jar to c:\repository\...\enterprise-ws-client\1.1-SNAPSHOT\enterprise-ws-client-1.1-SNAPSHOT.jar
[artifact:pom] Using remote repositories:
  - id=central, url=http://repo1.maven.org/maven2, releases=enabled, snapshots=disabled
     [echo] installing pom

BUILD FAILED
C:\dev\enterprise-ws\build.xml:231: java.lang.NullPointerException
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:115)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.Target.execute(Target.java:357)
	at org.apache.tools.ant.Target.performTasks(Target.java:385)
	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
	at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
	at org.eclipse.ant.internal.ui.antsupport.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
	at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
	at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAntRunner.java:423)
	at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAntRunner.java:137)
Caused by: java.lang.NullPointerException
	at org.apache.maven.artifact.installer.DefaultArtifactInstaller.install(DefaultArtifactInstaller.java:71)
	at org.apache.maven.artifact.ant.InstallTask.doExecute(InstallTask.java:62)
	at org.apache.maven.artifact.ant.AbstractArtifactTask.execute(AbstractArtifactTask.java:665)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
	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:585)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
	... 10 more
--- Nested Exception ---
java.lang.NullPointerException
	at org.apache.maven.artifact.installer.DefaultArtifactInstaller.install(DefaultArtifactInstaller.java:71)
	at org.apache.maven.artifact.ant.InstallTask.doExecute(InstallTask.java:62)
	at org.apache.maven.artifact.ant.AbstractArtifactTask.execute(AbstractArtifactTask.java:665)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
	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:585)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.Target.execute(Target.java:357)
	at org.apache.tools.ant.Target.performTasks(Target.java:385)
	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)


	at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
	at org.eclipse.ant.internal.ui.antsupport.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
	at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
	at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAntRunner.java:423)
	at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAntRunner.java:137)

Total time: 5 seconds

		<!-- install client jar into maven repo -->
		<artifact:dependencies settingsFile="../tools/maven/conf/settings.xml" />
		<property name="M2_HOME" value="../tools/maven" />

		<artifact:localRepository id="local.repository" path="c:/repository" layout="default" />

		<artifact:pom id="pom.es-client" file="etc/maven-client-es/pom.xml">
			<localRepository refid="local.repository" />
		</artifact:pom>

		<artifact:install file="${dist.dir}/client-${es.jar}">
			<localRepository refid="local.repository" />
			<pom refid="pom.es-client" />
		</artifact:install>

		<!-- install main pom -->
		<artifact:pom id="pom.es" file="pom.xml">
			<localRepository refid="local.repository" />
		</artifact:pom>
<echo>installing pom</echo>
		<artifact:install>
			<localRepository refid="local.repository" />
			<pom refid="pom.es" />
		</artifact:install>