Fix crash if 3d window is not there when importing summary data

ApplicationLibCode/Commands/RicImportEnsembleFeature.cpp

@@ -130,7 +130,7 @@ void RicImportEnsembleFeature::importSingleEnsemble( const QStringList&
 
     if ( allCases.size() == 0 )
     {
-        RiuMainWindow::instance()->close();
+        RiuMainWindow::closeIfOpen();
     }
 }
 

ApplicationLibCode/Commands/RicImportSummaryCasesFeature.cpp

@@ -106,7 +106,7 @@ void RicImportSummaryCasesFeature::onActionTriggered( bool isChecked )
 
     if ( allCases.size() == 0 )
     {
-        RiuMainWindow::instance()->close();
+        RiuMainWindow::closeIfOpen();
     }
 }
 
@@ -155,7 +155,7 @@ bool RicImportSummaryCasesFeature::createAndAddSummaryCasesFromFiles( const QStr
 
             if ( allCases.size() == 0 )
             {
-                RiuMainWindow::instance()->close();
+                RiuMainWindow::closeIfOpen();
             }
         }
         return true;

ApplicationLibCode/Commands/RicImportSummaryGroupFeature.cpp

@@ -79,7 +79,7 @@ void RicImportSummaryGroupFeature::onActionTriggered( bool isChecked )
 
     if ( allCases.size() == 0 )
     {
-        RiuMainWindow::instance()->close();
+        RiuMainWindow::closeIfOpen();
     }
 }
 

ApplicationLibCode/Commands/SummaryPlotCommands/RicSummaryPlotFeatureImpl.cpp

@@ -500,7 +500,7 @@ void RicSummaryPlotFeatureImpl::createSummaryPlotsFromArgumentLine( const QStrin
             RiuPlotMainWindowTools::setExpanded( lastPlotCreated );
             RiuPlotMainWindowTools::selectAsCurrentItem( lastPlotCreated );
 
-            RiuMainWindow::instance()->close();
+            RiuMainWindow::closeIfOpen();
         }
     }
     else

ApplicationLibCode/UserInterface/RiuMainWindow.cpp

@@ -192,6 +192,14 @@ RiuMainWindow* RiuMainWindow::instance()
     return nullptr;
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RiuMainWindow::closeIfOpen()
+{
+    if ( instance() != nullptr ) instance()->close();
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------

ApplicationLibCode/UserInterface/RiuMainWindow.h

@@ -83,6 +83,7 @@ public:
     ~RiuMainWindow() override;
 
     static RiuMainWindow* instance();
+    static void           closeIfOpen();
 
     QString mainWindowName() override;