install with classifier with no target/classes fails
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                 Key: MINSTALL-40
                 URL: http://jira.codehaus.org/browse/MINSTALL-40
             Project: Maven 2.x Install Plugin
          Issue Type: Bug
    Affects Versions: 2.2, 2.1
         Environment: Maven version: 2.0.5, Winx XP pro
            Reporter: Michele Lorenzini
            Priority: Minor
         Attachments: sample-war.zip

The install plugin fails with the following error:
Error installing artifact: File C:\TEMP\sample-war\target\classes does not exist
in a project where there is no class or classpath resource generation (so the 
target/classes folder is not generated in the compile phase).
Suppose for example a war application with no java source code (maybe only jar 
dependencies) and no classpath resource.
Installing the project as a primary artifact works fine.
Installing the project as a secondary artifact (so with "classifier" option) 
with classes or resources works fine.
Installing the project as a secondary artifact without classes or resources 
gives the error below.
Attached is a simple project with packaging WAR composed only by a web.xml file.
Running "mvn install" on this project should give the error above. Commenting 
the classifier tag will result in a successful install.
Also if I put a simple java file (or a resource) the compile goal will create 
target/classes folder and the install works fine.
In fact I am using this kind of workaround for the moment (include a dummy 
resource in the war build).
The same is with a similar jar project (although it may be less useful to have 
an "empty" jar artifact).
Verified with both maven-install-plugin 2.1 and 2.2


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