Hardcoded default empty space

datasets/datasets.php

 <?php
 
-$EMPTY_SPACE_FILE = __DIR__."/empty-space.json";
+$EMPTY_SPACE = '{"links":[],"nodes":[]}';
 $SPACES_DIR = __DIR__."/spaces/";
 
 add_action("wp_ajax_get_space", "kg_get_space"); // Fires only for logged-in-users
@@ -91,10 +91,9 @@ function kg_create_empty_space($file_path) {
         return;
     }
 
-    // Read and copy default empty graph from default file
-    global $EMPTY_SPACE_FILE;
-    $empty_graph = file_get_contents($EMPTY_SPACE_FILE);
-    file_put_contents($file_path, $empty_graph);
+    // Write empty space to file
+    global $EMPTY_SPACE;
+    file_put_contents($file_path, $EMPTY_SPACE);
 }
 
 function endsWith( $haystack, $needle ) {

datasets/empty-space.json

-{"links":[],"nodes":[]}
\ No newline at end of file