remove assert. not the proper way to handle this

src/core.cpp

@@ -83,7 +83,7 @@ std::string CTransaction::GetUsername() const
     if(userName.IsSmallString()) {
         return userName.ExtractSmallString();
     }
-    assert(!"username not small string");
+    //assert(!"username not small string");
     return std::string();
 }
 
@@ -93,7 +93,7 @@ uint256 CTransaction::GetUsernameHash() const
         return SerializeHash(userName.ExtractSmallString());
     }
     // [MF] TODO: remove this assert later, it will fail for spammessage.
-    assert(!"username not small string");
+    //assert(!"username not small string");
     return uint256();
 }