Allow empty active realizations

src/ert/gui/ertwidgets/models/activerealizationsmodel.py

@@ -5,7 +5,8 @@
 
 
 class ActiveRealizationsModel(ValueModel):
-    def __init__(self, ensemble_size: int):
+    def __init__(self, ensemble_size: int, show_default: bool = True):
+        self.show_default = show_default
         self.ensemble_size = ensemble_size
         ValueModel.__init__(self, self.getDefaultValue())
         self._custom = False
@@ -22,8 +23,10 @@ def setValueFromMask(self, mask):
         self.setValue(mask_to_rangestring(mask))
 
     def getDefaultValue(self):
-        size = self.ensemble_size
-        return f"0-{size-1:d}"
+        if self.show_default:
+            size = self.ensemble_size
+            return f"0-{size-1:d}"
+        return None
 
     def getActiveRealizationsMask(self) -> List[bool]:
         return ActiveRange(rangestring=self.getValue(), length=self.ensemble_size).mask

src/ert/gui/simulation/evaluate_ensemble_panel.py

@@ -42,7 +42,7 @@ def __init__(self, ensemble_size: int, run_path: str, notifier: ErtNotifier):
         layout.addRow(QLabel("Number of realizations:"), number_of_realizations_label)
 
         self._active_realizations_field = StringBox(
-            ActiveRealizationsModel(ensemble_size),
+            ActiveRealizationsModel(ensemble_size, show_default=False),
             "config/simulation/active_realizations",
         )
         self._active_realizations_field.setValidator(
@@ -66,6 +66,7 @@ def isConfigurationValid(self) -> bool:
         return (
             self._active_realizations_field.isValid()
             and self._ensemble_selector.currentIndex() != -1
+            and bool(self._active_realizations_field.text())
         )
 
     def getSimulationArguments(self) -> Arguments: