version can be null.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@8649 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Functions.java

@@ -715,7 +715,7 @@ public class Functions {
      *
      * @since 1.150
      */
-    public static Object defaulted(Object value, Object defaultValue) {
+    public static <T> T defaulted(T value, T defaultValue) {
         return value!=null ? value : defaultValue;
     }
 

core/src/main/java/hudson/maven/MavenModule.java

@@ -4,6 +4,7 @@ import hudson.CopyOnWrite;
 import hudson.FilePath;
 import hudson.StructuredForm;
 import hudson.Util;
+import hudson.Functions;
 import hudson.maven.reporters.MavenMailer;
 import hudson.model.AbstractProject;
 import hudson.model.Action;
@@ -243,7 +244,7 @@ public final class MavenModule extends AbstractMavenProject<MavenModule,MavenBui
      * Gets groupId+artifactId+version as {@link ModuleDependency}.
      */
     public ModuleDependency asDependency() {
-        return new ModuleDependency(moduleName,version);
+        return new ModuleDependency(moduleName,Functions.defaulted(version,ModuleDependency.UNKNOWN));
     }
 
     @Override