avoid division by zero if search is done for no words

this case is relevant if the bluewords (yacy.blue) are used

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@3698 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/http/httpdProxyHandler.java

@@ -229,7 +229,7 @@ public final class httpdProxyHandler extends httpdAbstractHandler implements htt
             
             // load a transformer
             transformer = new htmlFilterContentTransformer();
-            transformer.init(new File(switchboard.getRootPath(), switchboard.getConfig("plasmaBlueList", "")).toString());
+            transformer.init(new File(switchboard.getRootPath(), switchboard.getConfig(plasmaSwitchboard.LIST_BLUE, "")).toString());
             
             String f;
             // load the yellow-list

source/de/anomic/plasma/plasmaSearchEvent.java

@@ -339,7 +339,7 @@ public final class plasmaSearchEvent extends Thread implements Runnable {
         // retrieve entities that belong to the hashes
         profileLocal.startTimer();
         long start = System.currentTimeMillis();
-        Map inclusionContainers = wordIndex.getContainers(
+        Map inclusionContainers = (query.queryHashes.size() == 0) ? new HashMap() : wordIndex.getContainers(
                         query.queryHashes,
                         urlselection,
                         true,
@@ -369,6 +369,7 @@ public final class plasmaSearchEvent extends Thread implements Runnable {
         profileLocal.startTimer();
         long start = System.currentTimeMillis();
         indexContainer rcLocal = indexContainer.joinContainers(includeContainers,
+        		(query.queryHashes.size() == 0) ? 0 :
                 profileLocal.getTargetTime(plasmaSearchTimingProfile.PROCESS_JOIN) * query.queryHashes.size() / (query.queryHashes.size() + query.excludeHashes.size()),
                 query.maxDistance);
         long remaining = profileLocal.getTargetTime(plasmaSearchTimingProfile.PROCESS_JOIN) - System.currentTimeMillis() + start;