fix valuechanged for OTBChoiceWidget

otb/OTBAlgorithm.py

@@ -75,6 +75,7 @@ class OTBAlgorithm(QgsProcessingAlgorithm):
 
     #     return True, None
 
+    # TODO: check if this method is really required.
     def checkParameterValues(self, parameters, context):
         for key, value in parameters.items():
             param = self.parameterDefinition(key)

otb/OTBChoiceWidget.py

@@ -47,23 +47,26 @@ class OTBChoiceWidgetWrapper(WidgetWrapper):
         else:
             return self.dialog.algorithm()
 
-    def valueChanged(self, value):
-        if self.dialog.mainWidget() is None:
-            return
+    def setWrapperVisible(self, name, visible):
+        if self.dialogType == DIALOG_STANDARD:
+            if self.dialog.mainWidget() is None:
+               return
+            self.dialog.mainWidget().wrappers[name].widget.setVisible(visible)
+            if self.dialog.mainWidget().wrappers[name].label:
+                self.dialog.mainWidget().wrappers[name].label.setVisible(visible)
+        else:
+            if name in self.dialog.wrappers:
+                self.dialog.wrappers[name].widget.setVisible(visible)
+                if self.dialog.wrappers[name].label:
+                    self.dialog.wrappers[name].label.setVisible(visible)
 
+    def valueChanged(self, value):
         for parameter in self.get_algorithm().parameterDefinitions():
             if not 'group_key' in parameter.metadata() or parameter.metadata()['group_key'] != self.param.name():
                  continue
             name = parameter.name()
             v = self.value() == parameter.metadata()['group_value']
-            if self.dialogType == DIALOG_STANDARD:
-                self.dialog.mainWidget().wrappers[name].widget.setVisible(v)
-                if self.dialog.mainWidget().wrappers[name].label:
-                    self.dialog.mainWidget().wrappers[name].label.setVisible(v)
-            else:
-                self.dialog.wrappers[name].widget.setVisible(v)
-                if self.dialog.wrappers[name].label:
-                    self.dialog.wrappers[name].label.setVisible(v)
+            self.setWrapperVisible(name, v)
 
     def setValue(self, value):
         if value in self.param.options: