#14780 Create a best effort ensemble instead of nothing for None grouping

RiaEnsembleNameTools::groupFilesByEnsembleName had no branch for
EnsembleGroupingMode::NONE, so it silently returned an empty map and
no ensemble was created for this grouping mode. Add handling that
groups all input files into a single ensemble.

Also surface warning dialogs instead of silently doing nothing when
no ensemble/grid ensemble could be created from the selected files,
in RicImportGridAndSummaryEnsembleFeature and
RicCreateGridCaseEnsemblesFromFilesFeature.

ApplicationLibCode/Application/Tools/RiaEnsembleNameTools.cpp

@@ -394,6 +394,15 @@ std::map<QString, QStringList> RiaEnsembleNameTools::groupFilesByEnsembleName( c
             ensemblePaths[QString::fromStdString( ensembleName )] = groupPaths;
         }
     }
+    else if ( groupingMode == RiaDefines::EnsembleGroupingMode::NONE )
+    {
+        // No grouping requested: put all files into a single ensemble.
+        if ( !fileNames.isEmpty() )
+        {
+            QString ensembleName        = findSuitableEnsembleName( fileNames, groupingMode );
+            ensemblePaths[ensembleName] = fileNames;
+        }
+    }
 
     return ensemblePaths;
 }

ApplicationLibCode/Commands/EclipseCommands/RicCreateGridCaseEnsemblesFromFilesFeature.cpp

@@ -47,6 +47,9 @@
 #include <QAction>
 #include <QDir>
 #include <QFileInfo>
+#include <QMessageBox>
+
+#include <algorithm>
 
 CAF_CMD_SOURCE_INIT( RicCreateGridCaseEnsemblesFromFilesFeature, "RicCreateGridCaseEnsemblesFromFilesFeature" );
 
@@ -73,7 +76,18 @@ void RicCreateGridCaseEnsemblesFromFilesFeature::onActionTriggered( bool isCheck
         }
     }
 
-    if ( gridEnsembles.empty() ) return;
+    if ( fileNames.isEmpty() ) return;
+
+    bool anyCasesCreated = std::any_of( gridEnsembles.begin(),
+                                        gridEnsembles.end(),
+                                        []( RimEclipseCaseEnsemble* ensemble ) { return ensemble && !ensemble->cases().empty(); } );
+    if ( !anyCasesCreated )
+    {
+        QMessageBox::warning( RiaGuiApplication::widgetToUseAsParent(),
+                              "Grid Ensemble Import Failed",
+                              "No grid ensemble could be created from the selected files." );
+        return;
+    }
 
     auto firstEnsemble = gridEnsembles.front();
     if ( firstEnsemble->cases().empty() ) return;

ApplicationLibCode/Commands/RicImportGridAndSummaryEnsembleFeature.cpp

@@ -34,11 +34,13 @@
 #include "RimSummaryEnsemble.h"
 #include "RimViewNameConfig.h"
 
+#include "RiuMainWindow.h"
 #include "RiuPlotMainWindow.h"
 #include "RiuPlotMainWindowTools.h"
 
 #include <QAction>
 #include <QIcon>
+#include <QMessageBox>
 #include <QPointer>
 #include <QSet>
 #include <QSettings>
@@ -113,10 +115,21 @@ static void doImport( const RicImportGridAndSummaryEnsembleDialogResult& result,
 
     strippedPaths.removeDuplicates();
 
-    if ( strippedPaths.isEmpty() ) return;
+    if ( strippedPaths.isEmpty() )
+    {
+        QMessageBox::warning( RiuMainWindow::instance(), "No Files Found", "No grid or summary files were found to import." );
+        return;
+    }
 
     auto fileSets = RimEnsembleFileSetTools::createEnsembleFileSets( strippedPaths, result.groupingMode );
-    if ( fileSets.empty() ) return;
+    if ( fileSets.empty() )
+    {
+        QMessageBox::warning( RiuMainWindow::instance(),
+                              "Ensemble Import Failed",
+                              "No ensemble could be created from the selected files. The selected folder structure did not match the "
+                              "selected ensemble grouping mode. Try selecting a different grouping mode." );
+        return;
+    }
 
     bool gridEnsemblesCreated = false;
     if ( result.createGridEnsemble && !result.gridFiles.isEmpty() )
@@ -133,6 +146,10 @@ static void doImport( const RicImportGridAndSummaryEnsembleDialogResult& result,
                 if ( view ) view->nameConfig()->setAddCaseName( true );
             }
         }
+        else
+        {
+            QMessageBox::warning( RiuMainWindow::instance(), "Grid Ensemble Import Failed", "No grid ensemble could be created." );
+        }
     }
 
     if ( result.createSummaryEnsemble && !result.summaryFiles.isEmpty() )