Protect against trying to parse a blank line in selectHound().

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8522 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

mainwindow.cpp

@@ -7369,6 +7369,7 @@ void MainWindow::selectHound(QString line)
  * <Enter> is equivalent to double-clicking on the top-most line.
 */
 
+  if(line.length()==0) return;
   QString houndCall=line.split(" ",QString::SkipEmptyParts).at(0);
 
 // Don't add a call already enqueued or in QSO