ENH: Don't write badFaces when there are none.

applications/utilities/surface/surfaceCheck/surfaceCheck.C

@@ -396,6 +396,9 @@ int main(int argc, char *argv[])
                     problemFaces.append(faceI);
                 }
             }
+
+            if (!problemFaces.empty())
+            {
                 OFstream str("badFaces");
 
                 Info<< "Dumping bad quality faces to " << str.name() << endl
@@ -405,6 +408,7 @@ int main(int argc, char *argv[])
                 str << problemFaces;
             }
         }
+    }