Fixed small bug on LCManager.hasValidProof(...). It would return 'false' if at...

Fixed small bug on LCManager.hasValidProof(...). It would return 'false' if at least one of the messages was invalid.

src/bftsmart/tom/leaderchange/LCManager.java

@@ -873,7 +873,7 @@ public class LCManager {
                 }
    
             } else {
-                return false; // the proof is invalid
+                bftsmart.tom.util.Logger.println("(LCManager.hasValidProof) Proof is invalid");
             }
         }