NPEs fixes

plugins/org.jkiss.dbeaver.core/src/org/jkiss/dbeaver/ui/dialogs/connection/DriverPropertiesDialogPage.java

@@ -91,7 +91,7 @@ public class DriverPropertiesDialogPage extends ConnectionPageAbstract
                         try {
                             propertySource = propsControl.makeProperties(
                                 monitor,
-                                site.getDriver(),
+                                getSite().getDriver(),
                                 tmpConnectionInfo);
                         } finally {
                             monitor.done();

plugins/org.jkiss.dbeaver.ui.editors.data/src/org/jkiss/dbeaver/ui/controls/resultset/panel/metadata/MetaDataPanel.java

@@ -236,7 +236,10 @@ public class MetaDataPanel implements IResultSetPanel {
                     @Override
                     public void completeLoading(Collection<DBDAttributeBinding> items) {
                         super.completeLoading(items);
-                        ((TreeViewer)attributeList.getItemsViewer()).expandToLevel(2);
+                        TreeViewer itemsViewer = (TreeViewer) attributeList.getItemsViewer();
+                        if (!itemsViewer.getControl().isDisposed()) {
+                            itemsViewer.expandToLevel(2);
+                        }
                     }
                 });
         }