Improve icon and label behavior for target selector

I modified the text margins, removed the inconsistent
"No project" label and made sure we fall back to
the default computer icon when no project is open.

src/plugins/coreplugin/fancyactionbar.cpp

@@ -227,13 +227,13 @@ QSize FancyToolButton::sizeHint() const
         QFontMetrics fm(boldFont);
         qreal lineHeight = fm.height();
         const QString projectName = defaultAction()->property("heading").toString();
-        buttonSize += QSizeF(0, 4);
+        buttonSize += QSizeF(0, 10);
         if (!projectName.isEmpty())
-            buttonSize += QSizeF(0, lineHeight + 6);
+            buttonSize += QSizeF(0, lineHeight + 2);
 
         const QString buildConfiguration = defaultAction()->property("subtitle").toString();
         if (!buildConfiguration.isEmpty())
-            buttonSize += QSizeF(0, lineHeight + 6);
+            buttonSize += QSizeF(0, lineHeight + 2);
     }
     return buttonSize.toSize();
 }

src/plugins/projectexplorer/miniprojecttargetselector.cpp

@@ -550,12 +550,12 @@ void MiniProjectTargetSelector::updateAction()
 {
     Project *project = ProjectExplorerPlugin::instance()->startupProject();
 
-    QString projectName = tr("No Project");
+    QString projectName;;
     QString targetName;
     QString targetToolTipText;
-    QIcon targetIcon;
     QString buildConfig;
     QString runConfig;
+    QIcon targetIcon = style()->standardIcon(QStyle::SP_ComputerIcon);
 
     if (project) {
         projectName = project->displayName();