Fixed NPE in Table tooltip handling (#10705)

Change-Id: I907af51c06c68da26c74359fae4e6f9a43dda8bc

client/src/com/vaadin/client/ui/VScrollTable.java

@@ -4985,7 +4985,8 @@ public class VScrollTable extends FlowPanel implements HasWidgets,
 
                 TooltipInfo info = null;
                 final Element targetTdOrTr = getTdOrTr((Element) target.cast());
-                if ("td".equals(targetTdOrTr.getTagName().toLowerCase())) {
+                if (targetTdOrTr != null
+                        && "td".equals(targetTdOrTr.getTagName().toLowerCase())) {
                     TableCellElement td = (TableCellElement) targetTdOrTr
                             .cast();
                     info = cellToolTips.get(td);

uitest/src/com/vaadin/tests/components/table/PopupViewInTable.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2012 Vaadin Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.tests.components.table;
+
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Component;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.PopupView;
+import com.vaadin.ui.Table;
+import com.vaadin.ui.VerticalLayout;
+
+public class PopupViewInTable extends AbstractTestUI {
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        Table t = new Table();
+        t.addContainerProperty("text", String.class, "");
+        t.addContainerProperty("pv", Component.class, null);
+        t.addItem(new Object[] { "Foo", createPopupView() }, "foo");
+        addComponent(t);
+    }
+
+    private PopupView createPopupView() {
+        PopupView pv = new PopupView("Click me", createContent());
+        return pv;
+    }
+
+    private Component createContent() {
+        VerticalLayout vl = new VerticalLayout(new Label("Hello"), new Button(
+                "World"));
+        return vl;
+    }
+
+    @Override
+    protected String getTestDescription() {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    protected Integer getTicketNumber() {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+}