Sync bnd code

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1412393 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/bundleplugin/src/main/java/aQute/bnd/osgi/Analyzer.java b/bundleplugin/src/main/java/aQute/bnd/osgi/Analyzer.java
index fbbf4fa..7548f51 100755
--- a/bundleplugin/src/main/java/aQute/bnd/osgi/Analyzer.java
+++ b/bundleplugin/src/main/java/aQute/bnd/osgi/Analyzer.java
@@ -2008,7 +2008,7 @@
 
 	private static String removeLeadingZeroes(String group) {
 		if (group == null)
-			return null;
+			return "0";
 
 		int n = 0;
 		while (n < group.length() - 1 && group.charAt(n) == '0')