do not show empty help dialog

git-svn-id: http://svn.code.sf.net/p/qmmp-dev/code/trunk/qmmp@8707 90c681e8-e032-0410-971d-27865f9a5e38

1 files changed, 12 insertions, 8 deletions

diff --git a/src/app/qmmpstarter.cpp b/src/app/qmmpstarter.cpp
index e78796783..efa5e6c48 100644
--- a/src/app/qmmpstarter.cpp
+++ b/src/app/qmmpstarter.cpp
@@ -120,18 +120,22 @@ QMMPStarter::QMMPStarter() : QObject()
             {
                 m_exit_code = EXIT_SUCCESS;
                 m_finished = true;
-                //show dialog with command line documentation under ms windows
+                QString out = CommandLineManager::executeCommand(key, commands.value(key)).trimmed();
+                if(!out.isEmpty())
+                {
+                    //show dialog with command line documentation under ms windows
 #ifdef Q_OS_WIN
-                stringstream tmp_stream;
-                tmp_stream.copyfmt(cout);
-                streambuf* old_stream = cout.rdbuf(tmp_stream.rdbuf());
+                    stringstream tmp_stream;
+                    tmp_stream.copyfmt(cout);
+                    streambuf *old_stream = cout.rdbuf(tmp_stream.rdbuf());
 #endif
-                cout << qPrintable(CommandLineManager::executeCommand(key, commands.value(key)).trimmed()) << endl;
+                    cout << qPrintable(CommandLineManager::executeCommand(key, commands.value(key)).trimmed()) << endl;
 #ifdef Q_OS_WIN
-                string text = tmp_stream.str();
-                QMessageBox::information(nullptr, tr("Command Line Help"), QString::fromLocal8Bit(text.c_str()));
-                cout.rdbuf(old_stream); //restore old stream buffer
+                    string text = tmp_stream.str();
+                    QMessageBox::information(nullptr, tr("Command Line Help"), QString::fromLocal8Bit(text.c_str()));
+                    cout.rdbuf(old_stream); //restore old stream buffer
 #endif
+                }
                 return;
             }
         }