#321 get rid of nodes dictionary that doesn't exist and refactor it i…

…nto other for loop

report_stats_on_json_kg.py

@@ -207,18 +207,15 @@ def count_orphan_nodes(nodes: list, edges: list):
 
     build_info = dict()
 
-    for n in nodes:  # search for build info node starting at end
-        if n["id"] == kg2_util.CURIE_PREFIX_RTX + ':' + 'KG2':  # should be the first node accessed
+    number_of_nodes = 0
+    for node in kg2_util.read_json_lines(input_nodes_file):
+        number_of_nodes += 1
+        if n["id"] == kg2_util.CURIE_PREFIX_RTX + ':' + 'KG2':
             build_info = n
-            break
 
     if len(build_info) == 0:
         print("WARNING: 'build' property is missing from the input JSON.", file=sys.stderr)
 
-    number_of_nodes = 0
-    for node in kg2_util.read_json_lines(input_nodes_file):
-        number_of_nodes += 1
-
     number_of_edges = 0
     for edge in kg2_util.read_json_lines(input_edges_file):
         number_of_edges += 1