#3048 RSV auto-refresh - NPE fix

plugins/org.jkiss.dbeaver.core/src/org/jkiss/dbeaver/ui/controls/autorefresh/AutoRefreshJob.java

@@ -30,6 +30,8 @@ public class AutoRefreshJob extends AbstractJob {
 
     AutoRefreshJob(AutoRefreshControl refreshControl) {
         super("Auto-refresh job (" + refreshControl.getControlId() + ")");
+        setSystem(true);
+        setUser(false);
         this.refreshControl = refreshControl;
     }
 

plugins/org.jkiss.dbeaver.core/src/org/jkiss/dbeaver/ui/controls/resultset/ResultSetViewer.java

@@ -2617,6 +2617,11 @@ public class ResultSetViewer extends Viewer
             UIUtils.showMessageBox(viewerPanel.getShell(), "Data read", "Data read is in progress - can't run another", SWT.ICON_WARNING);
             return false;
         }
+        DBCExecutionContext executionContext = getExecutionContext();
+        if (executionContext == null) {
+            UIUtils.showMessageBox(viewerPanel.getShell(), "Data read", "Can't read data - no active connection", SWT.ICON_WARNING);
+            return false;
+        }
         // Cancel any refresh jobs
         autoRefreshControl.cancelRefresh();
 
@@ -2633,7 +2638,7 @@ public class ResultSetViewer extends Viewer
             dataContainer,
             useDataFilter,
             this,
-            getExecutionContext(),
+            executionContext,
             progressControl);
         dataPumpJob.addJobChangeListener(new JobChangeAdapter() {
             @Override