lineEnding parameter makes assembly ignore empty directories

pom.xml
src/main/assembly/assembly.xml
src/main/include/a/test.txt
                /b/

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>test</groupId>
    <artifactId>test</artifactId>
    <version>0-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>test</name>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <appendAssemblyId>false</appendAssemblyId>
                    <attach>false</attach>
                    <descriptors>
                        <descriptor>src/main/assembly/assembly.xml</descriptor>
                    </descriptors>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

<assembly
        xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
    <id>distribution</id>

    <formats>
        <format>tar.gz</format>
    </formats>

    <fileSets>
        <fileSet>
            <directory>src/main/include</directory>
            <outputDirectory>/</outputDirectory>
            <lineEnding>unix</lineEnding>
        </fileSet>
    </fileSets>
</assembly>

mvn clean assembly:single

set MAVEN_OPTS="-Xmx256m"
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building test
[INFO]    task-segment: [clean, assembly:single]
[INFO] ------------------------------------------------------------------------
[INFO] [clean:clean {execution: default-clean}]
[INFO] Deleting directory C:\ATM\emptybug\trunk\target
[INFO] [assembly:single {execution: default-cli}]
[INFO] Reading assembly descriptor: src/main/assembly/assembly.xml
[INFO] Building tar : C:\ATM\emptybug\trunk\target\test-0-SNAPSHOT.tar.gz
[WARNING] Assembly file: C:\ATM\emptybug\trunk\target\test-0-SNAPSHOT.tar.gz is not a regular file (
it may be a directory). It cannot be attached to the project build for installation or deployment.
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1 second
[INFO] Finished at: Thu Oct 06 09:06:23 EDT 2011
[INFO] Final Memory: 8M/162M
[INFO] ------------------------------------------------------------------------
bsdtar ztvf target\test-0-SNAPSHOT.tar.gz
drwxr-xr-x  0 0      0           0 Oct 06 09:06 test-0-SNAPSHOT/
drwxr-xr-x  0 0      0           0 Oct 06 09:06 test-0-SNAPSHOT/a/
-rw-r--r--  0 0      0           0 Oct 06 09:06 test-0-SNAPSHOT/a/test.txt