core/modules/block/block.module |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/core/modules/block/block.module b/core/modules/block/block.module
index 3018f38..9c6a013 100644
--- a/core/modules/block/block.module
+++ b/core/modules/block/block.module
@@ -174,8 +174,12 @@ function block_get_blocks_by_region($region) {
         $build[$key] = entity_view($block, 'block');
       }
     }
-    // block_list() already returned the blocks in sorted order.
-    $build['#sorted'] = TRUE;
+    // If none of the blocks in this region are visible, then don't set anything
+    // else in the render array, because that would cause the region to show up.
+    if (!empty($build)) {
+      // block_list() already returned the blocks in sorted order.
+      $build['#sorted'] = TRUE;
+    }
   }
   return $build;
 }