Fix DataCommunicator parameter not used in Grid constructor (#10075)

Fixes #9944

server/src/main/java/com/vaadin/ui/Grid.java

      * @since 8.0.7
      */
     protected Grid(Class<T> beanType, DataCommunicator<T> dataCommunicator) {
-        this(BeanPropertySet.get(beanType));
+        this(BeanPropertySet.get(beanType), dataCommunicator);
         this.beanType = beanType;
     }
 

server/src/test/java/com/vaadin/tests/server/component/grid/GridTest.java

 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import com.vaadin.data.provider.DataCommunicator;
 import org.easymock.Capture;
 import org.junit.Assert;
 import org.junit.Before;
                 .setId("randomColumnId");
     }
 
+    @Test
+    public void testCreateGridWithDataCommunicator() {
+        DataCommunicator specificDataCommunicator = new DataCommunicator<>();
+
+        TestGrid<String> grid = new TestGrid(String.class, specificDataCommunicator);
+
+        assertEquals(specificDataCommunicator, grid.getDataCommunicator());
+    }
+
     @Test
     public void testGridHeightModeChange() {
         assertEquals("Initial height mode was not CSS", HeightMode.CSS,

server/src/test/java/com/vaadin/tests/server/component/grid/TestGrid.java

+package com.vaadin.tests.server.component.grid;
+
+import com.vaadin.data.provider.DataCommunicator;
+import com.vaadin.ui.Grid;
+
+/**
+ * {@link Grid} class for testing purposes
+ * @param <T>
+ *            the grid bean type
+ */
+public class TestGrid<T> extends Grid<T> {
+
+    public TestGrid(Class<T> beanType, DataCommunicator<T> dataCommunicator) {
+        super(beanType, dataCommunicator);
+    }
+
+}