Move "go_further()" check up

So it doesn't purge zombies or print gate info that would not be refined

Alpha_wrap_3/include/CGAL/Alpha_wrap_3/internal/Alpha_wrap_3.h

@@ -1327,6 +1327,9 @@ private:
     // Explore all finite cells that are reachable from one of the initial outside cells.
     while(!m_queue.empty())
     {
+      if(!visitor.go_further(*this))
+        return false;
+
 #ifdef CGAL_AW3_DEBUG_QUEUE_PP
       check_queue_sanity();
 #endif
@@ -1379,9 +1382,6 @@ private:
       face_out.close();
 #endif
 
-      if(!visitor.go_further(*this))
-        return false;
-
       visitor.before_facet_treatment(*this, gate);
 
       m_queue.pop();