fix BuildHandler NPE from previous checkin

router/java/src/net/i2p/router/RouterVersion.java

@@ -18,7 +18,7 @@ public class RouterVersion {
     /** deprecated */
     public final static String ID = "Monotone";
     public final static String VERSION = CoreVersion.VERSION;
-    public final static long BUILD = 6;
+    public final static long BUILD = 7;
 
     /** for example "-test" */
     public final static String EXTRA = "";

router/java/src/net/i2p/router/tunnel/pool/BuildHandler.java

@@ -866,7 +866,7 @@ class BuildHandler implements Runnable {
                     if (accept) {
                         // early request throttle check, before queueing and decryption
                         Hash fh = fromHash;
-                        if (fh == null)
+                        if (fh == null && from != null)
                             fh = from.calculateHash();
                         if (fh != null && _requestThrottler.shouldThrottle(fh)) {
                             if (_log.shouldLog(Log.WARN))