versions:set Fails for Projects with No Dependencies
----------------------------------------------------

                 Key: MVERSIONS-44
                 URL: http://jira.codehaus.org/browse/MVERSIONS-44
             Project: Maven 2.x Versions Plugin
          Issue Type: Bug
    Affects Versions: 1.0-beta-1
            Reporter: Tracy Hartford


When trying to use versions:set on a POM with no dependencies, an empty stack 
error occurs, such as below:

[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] null
[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.util.EmptyStackException
        at java.util.Stack.peek(Stack.java:79)
        at java.util.Stack.pop(Stack.java:61)
        at 
org.codehaus.mojo.versions.api.PomHelper.setDependencyVersion(PomHelper.java:564)
        at org.codehaus.mojo.versions.SetMojo.update(SetMojo.java:284)
        at 
org.codehaus.mojo.versions.AbstractVersionsUpdaterMojo.process(AbstractVersionsUpdaterMojo.java:339)
        at org.codehaus.mojo.versions.SetMojo.execute(SetMojo.java:217)
        at 
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:453)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:559)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:513)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:483)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:331)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:228)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:301)
        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)
[INFO] ------------------------------------------------------------------------


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