FELIX-4886 : Check for ConfigAdmin#listConfigurations returning null

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1678980 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/webconsole/src/main/java/org/apache/felix/webconsole/internal/configuration/ConfigManager.java b/webconsole/src/main/java/org/apache/felix/webconsole/internal/configuration/ConfigManager.java
index 211deee..bc7c69c 100644
--- a/webconsole/src/main/java/org/apache/felix/webconsole/internal/configuration/ConfigManager.java
+++ b/webconsole/src/main/java/org/apache/felix/webconsole/internal/configuration/ConfigManager.java
@@ -303,7 +303,7 @@
                     // configuration
                     final Configuration[] configs = ca.listConfigurations( filter );
                     boolean printComma = false;
-                    for(int i=0; i<configs.length; i++)
+                    for(int i=0; configs != null && i<configs.length; i++)
                     {
                         final Configuration config = configs[i];
                         if ( config != null )