MQE-882: Cannot input <data> tags in entity xml

- added verification test

Author: okolesnyk

dev/tests/verification/Resources/BasicFunctionalTest.txt

@@ -60,6 +60,8 @@ class BasicFunctionalTestCest
 	 */
 	public function BasicFunctionalTest(AcceptanceTester $I)
 	{
+		$I->comment("");
+		$I->comment("");
 		$someVarDefinition = $I->grabValueFrom();
 		$I->acceptPopup();
 		$I->amOnPage("/test/url");

dev/tests/verification/TestModule/Data/ReplacementData.xml

@@ -30,4 +30,8 @@
         <data key="x">200</data>
         <data key="y">300</data>
     </entity>
+    <entity name="emptyData" type="backend">
+        <data key="noData"></data>
+        <data key="definitelyNoData"/>
+    </entity>
 </entities>

dev/tests/verification/TestModule/Test/BasicFunctionalTest.xml

@@ -22,6 +22,8 @@
         <after>
             <amOnPage url="/afterUrl" stepKey="afterAmOnPageKey"/>
         </after>
+        <comment stepKey="basicCommentWithNoData" userInput="{{emptyData.noData}}"/>
+        <comment stepKey="basicCommentWithDefinitelyNoData" userInput="{{emptyData.definitelyNoData}}"/>
         <grabValueFrom stepKey="someVarDefinition"/>
         <acceptPopup stepKey="acceptPopupKey1"/>
         <amOnPage stepKey="amOnPageKey1" url="/test/url"/>