FELIX-2169: Improve dev:show-tree performance and avoid NPE when no matching export is found

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@918963 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/karaf/assembly/src/main/descriptors/unix-bin.xml b/karaf/assembly/src/main/descriptors/unix-bin.xml
index bd22dee..d148c48 100644
--- a/karaf/assembly/src/main/descriptors/unix-bin.xml
+++ b/karaf/assembly/src/main/descriptors/unix-bin.xml
@@ -170,6 +170,15 @@
                 <include>org.ops4j.pax.url:pax-url-wrap</include>
             </includes>
         </dependencySet>
+       <dependencySet>
+            <outputDirectory>/system</outputDirectory>
+            <unpack>false</unpack>
+            <useProjectArtifact>false</useProjectArtifact>
+            <outputFileNameMapping>org/apache/felix/karaf/${artifact.artifactId}/${artifact.baseVersion}/${artifact.artifactId}-${artifact.baseVersion}${dashClassifier?}.${artifact.extension}</outputFileNameMapping>
+            <includes>
+                <include>org.apache.felix.karaf:org.apache.felix.karaf.commons</include>
+            </includes>
+        </dependencySet>
         <dependencySet>
             <outputDirectory>/system</outputDirectory>
             <unpack>false</unpack>