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/pom.xml b/karaf/pom.xml
index c4deca7..88eeb5c 100644
--- a/karaf/pom.xml
+++ b/karaf/pom.xml
@@ -35,6 +35,7 @@
 
     <modules>
         <module>main</module>
+        <module>commons</module>
         <module>features</module>
         <module>admin</module>
         <module>deployer</module>
@@ -171,6 +172,11 @@
                 <version>${pom.version}</version>
             </dependency>
             <dependency>
+                <groupId>org.apache.felix.karaf</groupId>
+                <artifactId>org.apache.felix.karaf.commons</artifactId>
+                <version>${pom.version}</version>
+            </dependency>
+            <dependency>
                 <groupId>org.apache.felix.karaf.deployer</groupId>
                 <artifactId>org.apache.felix.karaf.deployer.spring</artifactId>
                 <version>${pom.version}</version>