Update to-photoblog script

home/bin/to-photoblog

@@ -32,6 +32,7 @@ def main(args):
     print(f"Going to photoblog: {list(file_map.values())}")
 
     # Test each file doesn't already exist.
+    not_existing = list()
     if not args.lazy:
         print(f"Checking each file isn't already uploaded...")
         problems = False
@@ -46,8 +47,11 @@ def main(args):
                     print(f"Warning: file '{name}' already existed at '{test_url}' and won't be uploaded without --lazy")
                     problems = True
             except:
+                not_existing.append(name)
                 pass
 
+        print(f"New files not found on the blog: {not_existing}")
+
         if problems:
             quit()