Make ProductUrl/ProductUrlText optional.

src/modules/greeting/GreetingPage.cpp

@@ -1,6 +1,7 @@
 /* === This file is part of Calamares - <http://github.com/calamares> ===
  *
  *   Copyright 2014-2015, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2015,      Anke Boersma <demm@kaosx.us>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -120,20 +121,38 @@ GreetingPage::GreetingPage( QWidget* parent )
     ui->mainText->setWordWrap( true );
     ui->mainText->setOpenExternalLinks( true );
 
-    CALAMARES_RETRANSLATE(
-        ui->mainText->setText( tr( "<h1>Welcome to the %1 installer.</h1><br/>"
-                             "This program will ask you some questions and "
-                             "set up %2 on your computer." 
-                             "<a href=\"%3\"> %4 </a>" )
-                         .arg( Calamares::Branding::instance()->
-                               string( Calamares::Branding::VersionedName ) )
-                         .arg( Calamares::Branding::instance()->
-                               string( Calamares::Branding::ProductName ) ) 
-                         .arg( Calamares::Branding::instance()->
-                               string( Calamares::Branding::ProductURL ) )
-                         .arg( Calamares::Branding::instance()->
-                               string( Calamares::Branding::UrlText ) ) );
-    )
+    if ( Calamares::Branding::instance()->
+            string( Calamares::Branding::ProductUrl ).isEmpty() ||
+         Calamares::Branding::instance()->
+            string( Calamares::Branding::ProductUrlText ).isEmpty() )
+    {
+        CALAMARES_RETRANSLATE(
+            ui->mainText->setText( tr( "<h1>Welcome to the %1 installer.</h1><br/>"
+                                       "This program will ask you some questions and "
+                                       "set up %2 on your computer." )
+                                    .arg( Calamares::Branding::instance()->
+                                          string( Calamares::Branding::VersionedName ) )
+                                    .arg( Calamares::Branding::instance()->
+                                          string( Calamares::Branding::ProductName ) ) );
+        )
+    }
+    else
+    {
+        CALAMARES_RETRANSLATE(
+            ui->mainText->setText( tr( "<h1>Welcome to the %1 installer.</h1><br/>"
+                                       "This program will ask you some questions and "
+                                       "set up %2 on your computer.<br/>"
+                                       "<a href=\"%3\"> %4 </a>" )
+                                    .arg( Calamares::Branding::instance()->
+                                          string( Calamares::Branding::VersionedName ) )
+                                    .arg( Calamares::Branding::instance()->
+                                          string( Calamares::Branding::ProductName ) )
+                                    .arg( Calamares::Branding::instance()->
+                                          string( Calamares::Branding::ProductUrl ) )
+                                    .arg( Calamares::Branding::instance()->
+                                          string( Calamares::Branding::ProductUrlText ) ) );
+        )
+    }
 
     ui->aboutButton->setIcon( CalamaresUtils::defaultPixmap( CalamaresUtils::Information,
                                                              CalamaresUtils::Original,