Merge pull request #13929 from mantidproject/13660_save_workspaces

Works as described. Only workspaces that are not WorkspaceGroup show up in the list.

scripts/Interface/ui/reflectometer/refl_save.py

-#pylint: disable=invalid-name
+#pylint: disable-all
 from PyQt4 import QtCore, QtGui
 import os
 from mantid.simpleapi import *
-from mantid.api import WorkspaceGroup
+from mantid.api import WorkspaceGroup, AnalysisDataService
 import xml.etree.ElementTree as xml
 from isis_reflectometry.quick import *
 from isis_reflectometry.procedures import *
@@ -239,9 +239,15 @@ class Ui_SaveWindow(object):
         self.pushButton.setText(QtGui.QApplication.translate("SaveWindow", "SAVE", None, QtGui.QApplication.UnicodeUTF8))
         self.pushButton_2.setText(QtGui.QApplication.translate("SaveWindow", "Refresh", None, QtGui.QApplication.UnicodeUTF8))
 
+    def _get_saveable_workspace_names(self):
+        names = mtd.getObjectNames()
+        # Exclude WorkspaceGroups from our list. We cannot save them to ASCII.
+        names = [i for i in names if not isinstance(AnalysisDataService.retrieve(i), WorkspaceGroup)]
+        return names
+    
     def filterWksp(self):
         self.listWidget.clear()
-        names = mtd.getObjectNames()
+        names = self._get_saveable_workspace_names()
         if self.regExCheckBox.isChecked():
             regex=re.compile(self.filterEdit.text())
             filtered = list()
@@ -268,7 +274,7 @@ class Ui_SaveWindow(object):
 
     def populateList(self):
         self.listWidget.clear()
-        names = mtd.getObjectNames()
+        names = self._get_saveable_workspace_names()
         if len(names):
             RB_Number=groupGet(names[0],'samp','rb_proposal')
             for ws in names: