fix to unbalanced tag and license for null objects

htroot/yacysearch.html

@@ -69,10 +69,9 @@
 <div id="api">
 <script type="text/javascript">
 //<![CDATA[
-document.write("\<a href=\"yacysearch.rss?" + window.location.search.substring(1) + "\"\>")
+document.write("\<a href=\"yacysearch.rss?" + window.location.search.substring(1) + "\"\><img src=\"env/grafics/api.png\" width=\"60\" height=\"40\" alt=\"API\" /></a>")
 //]]>
 </script>
-<img src="env/grafics/api.png" width="60" height="40" alt="API" /></a>
 <span>This search result can also be retrieved as RSS/<a href="http://www.opensearch.org">opensearch</a> output.
 The query format is similar to <a href="http://www.loc.gov/standards/sru/">SRU</a>.
 Click the API icon to see an example call to the search rss API.

source/net/yacy/data/URLLicense.java

@@ -42,6 +42,7 @@ public class URLLicense {
     private static final Map<String, String> permissions = Collections.synchronizedMap(new SizeLimitedMap<String, String>(maxQueue));
 
     public static String aquireLicense(final DigestURI url) {
+        if (url == null) return "";
         // generate license key
         String license = ASCII.String(url.hash());
         // store reference to url with license key