trivial: improve log message for unknown package types

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/commons/filevault-package-maven-plugin/trunk@1873030 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/jackrabbit/filevault/maven/packaging/ValidationHelper.java b/src/main/java/org/apache/jackrabbit/filevault/maven/packaging/ValidationHelper.java
index 3f51d31..1ba7665 100644
--- a/src/main/java/org/apache/jackrabbit/filevault/maven/packaging/ValidationHelper.java
+++ b/src/main/java/org/apache/jackrabbit/filevault/maven/packaging/ValidationHelper.java
@@ -107,7 +107,8 @@
     }
 
     public void printUsedValidators(Log log, ValidationExecutor executor, ValidationContext context, boolean printUnusedValidators) {
-        log.info("Using " + executor.getAllValidatorsById().entrySet().size() + " validators for package of type " + context.getProperties().getPackageType() + ": " + ValidationHelper.getValidatorNames(executor, ", "));
+        String packageType = context.getProperties().getPackageType() != null ? context.getProperties().getPackageType().toString() : "unknown";
+        log.info("Using " + executor.getAllValidatorsById().entrySet().size() + " validators for package of type " + packageType + ": " + ValidationHelper.getValidatorNames(executor, ", "));
         if (printUnusedValidators) {
             Map<String, Validator> unusedValidatorsById = executor.getUnusedValidatorsById();
             if (!unusedValidatorsById.isEmpty()) {