release:prepare fails if project does not contain directory src/main/java

i'm trying to perform mvn release:prepare on a project that does not contain any java sources (e.g. the directory src/main/java does not exist).

this seems to break build to break.

if i add the directory it seems to work.

> mvn release:prepare
[...]
[INFO] Tagging release with the label mps-webapplication-1.3...
[INFO] Executing: svn --non-interactive copy --file /tmp/maven-scm-248675112.commit . svn://42.42.0.23/mps/tags/mps-webapplication-1.3
[INFO] Working directory: /Users/bendt/Projekte/MPS/mps-webapplication
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Unable to tag SCM
Provider message:
The svn tag command failed.
Command output:
svn: Commit failed (details follow):
svn: Directory '/Users/bendt/Projekte/MPS/mps-webapplication/src/main/java' is missing

[INFO] ------------------------------------------------------------------------
[DEBUG] Trace
org.apache.maven.BuildFailureException: Unable to tag SCM
Provider message:
The svn tag command failed.
Command output:
svn: Commit failed (details follow):
svn: Directory '/Users/bendt/Projekte/MPS/mps-webapplication/src/main/java' is missing

at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:560)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:493)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:463)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:311)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:224)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:143)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:333)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:126)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:282)
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.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)
Caused by: org.apache.maven.plugin.MojoFailureException: Unable to tag SCM
Provider message:
The svn tag command failed.
Command output:
svn: Commit failed (details follow):
svn: Directory '/Users/bendt/Projekte/MPS/mps-webapplication/src/main/java' is missing

at org.apache.maven.plugins.release.PrepareReleaseMojo.execute(PrepareReleaseMojo.java:144)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:447)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:539)
... 16 more
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3 seconds
[INFO] Finished at: Tue Mar 11 16:29:29 CET 2008
[INFO] Final Memory: 6M/12M
[INFO] ------------------------------------------------------------------------