Simplify logic for showing UnconfiguredTargetPanel/TargetPanel

This doesn't change when the those panes are shown.

Change-Id: Ie5a2d27321e5268f59775892198999a8414a0adb
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/cmakeprojectmanager/cmakeproject.cpp

@@ -389,7 +389,7 @@ bool CMakeProject::needsConfiguration() const
 
 bool CMakeProject::requiresTargetPanel() const
 {
-    return false;
+    return !targets().isEmpty();
 }
 
 bool CMakeProject::isProjectFile(const FileName &fileName)

src/plugins/projectexplorer/projectexplorer.cpp

@@ -605,7 +605,7 @@ bool ProjectExplorerPlugin::initialize(const QStringList &arguments, QString *er
     unconfiguredProjectPanel->setPriority(-10);
     unconfiguredProjectPanel->setDisplayName(tr("Configure Project"));
     unconfiguredProjectPanel->setSupportsFunction([](Project *project){
-        return project->targets().isEmpty() && !project->requiresTargetPanel();
+        return project->needsConfiguration();
     });
     icon = QIcon(QLatin1String(":/projectexplorer/images/unconfigured.png"));
     unconfiguredProjectPanel->setSimpleCreateWidgetFunction<TargetSetupPageWrapper>(icon);
@@ -616,8 +616,7 @@ bool ProjectExplorerPlugin::initialize(const QStringList &arguments, QString *er
     displayName = QCoreApplication::translate("TargetSettingsPanelFactory", "Build & Run");
     targetSettingsPanelFactory->setDisplayName(displayName);
     targetSettingsPanelFactory->setSupportsFunction([](Project *project) {
-        return !project->targets().isEmpty()
-                || project->requiresTargetPanel();
+        return project->requiresTargetPanel();
     });
     targetSettingsPanelFactory->setCreateWidgetFunction([](Project *project) {
         return new TargetSettingsPanelWidget(project);

src/plugins/qmakeprojectmanager/qmakeproject.cpp

@@ -1363,7 +1363,7 @@ void QmakeProject::configureAsExampleProject(const QStringList &platforms)
 
 bool QmakeProject::requiresTargetPanel() const
 {
-    return false;
+    return !targets().isEmpty();
 }
 
 // All the Qmake run configurations should share code.