*) preventing null pointer exception in case empty search word or only one character is enterd or all search words are removed by filters

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6296 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/search/SearchEvent.java

@@ -137,11 +137,17 @@ public final class SearchEvent {
                     query.ranking,
                     query.constraint,
                     (query.domType == QueryParams.SEARCHDOM_GLOBALDHT) ? null : preselectedPeerHashes);
-            if (this.primarySearchThreads.length > fetchpeers) this.rankedCache.moreFeeders(this.primarySearchThreads.length - fetchpeers);
-            serverProfiling.update("SEARCH", new ProfilingGraph.searchEvent(query.id(true), "remote search thread start", this.primarySearchThreads.length, System.currentTimeMillis() - timer), false);
+            if (this.primarySearchThreads != null) {
+                if (this.primarySearchThreads.length > fetchpeers) this.rankedCache.moreFeeders(this.primarySearchThreads.length - fetchpeers);
+                serverProfiling.update("SEARCH", new ProfilingGraph.searchEvent(query.id(true), "remote search thread start", this.primarySearchThreads.length, System.currentTimeMillis() - timer), false);
+                // finished searching
+                Log.logFine("SEARCH_EVENT", "SEARCH TIME AFTER GLOBAL-TRIGGER TO " + primarySearchThreads.length + " PEERS: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
+            } else {
+                // no search since query is empty, user might have entered no data or filters have removed all search words
+                Log.logFine("SEARCH_EVENT", "NO SEARCH STARTED DUE TO EMPTY SEARCH REQUEST.");
+            }
+            
             
-            // finished searching
-            Log.logFine("SEARCH_EVENT", "SEARCH TIME AFTER GLOBAL-TRIGGER TO " + primarySearchThreads.length + " PEERS: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
         } else {
             // do a local search
             this.rankedCache = new RankingProcess(indexSegment, query, max_results_preparation, 2);