Fix hanging sample test (Azure#33623)

Author: christothes

sdk/tables/Azure.Data.Tables/samples/Sample4QueryEntities.md

@@ -102,8 +102,8 @@ Below is a simple example that illustrates how the token can be fetched and appl
 
 ```C# Snippet:TablesSample4QueryPagination
 string continuationToken = null;
-bool hadResults = true;
-while (hadResults)
+bool moreResultsAvailable = true;
+while (moreResultsAvailable)
 {
     Page<TableEntity> page = tableClient
         .Query<TableEntity>()
@@ -118,7 +118,7 @@ while (hadResults)
     continuationToken = page.ContinuationToken;
 
     IReadOnlyList<TableEntity> pageResults = page.Values;
-    hadResults = pageResults.Any();
+    moreResultsAvailable = pageResults.Any() && continuationToken != null;
 
     // Print out the results for this page.
     foreach (TableEntity result in pageResults)

sdk/tables/Azure.Data.Tables/tests/samples/Sample4_QueryEntities.cs

@@ -112,8 +112,8 @@ public void QueryEntities()
             #region Snippet:TablesSample4QueryPagination
 
             string continuationToken = null;
-            bool hadResults = true;
-            while (hadResults)
+            bool moreResultsAvailable = true;
+            while (moreResultsAvailable)
             {
                 Page<TableEntity> page = tableClient
                     .Query<TableEntity>()
@@ -128,7 +128,7 @@ public void QueryEntities()
                 continuationToken = page.ContinuationToken;
 
                 IReadOnlyList<TableEntity> pageResults = page.Values;
-                hadResults = pageResults.Any();
+                moreResultsAvailable = pageResults.Any() && continuationToken != null;
 
                 // Print out the results for this page.
                 foreach (TableEntity result in pageResults)