Fix #6 NullPointerException when top directories are not set

Author: junichi11

src/org/netbeans/modules/php/wordpress/util/GithubZipEntryFilter.java

@@ -96,6 +96,9 @@ public String getPath(ZipEntry entry) {
         String path = entry.getName();
         String[] splitPath = splitPath(path);
         String topDirectory = splitPath[0];
+        if (topDirectories == null) {
+            return path;
+        }
         if (splitPath.length == 1 || topDirectories.contains(topDirectory)) {
             return path;
         }