Fixed #134: account for missing speakers

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) (as of version 2.0.11).
 
+## [Unreleased]
+
+### Changed
+
+- Fixed crash on videos without speakers (#134)
+
 ## [2.0.11] - 2022-08-01
 
 ### Changed

ted2zim/scraper.py

@@ -545,10 +545,16 @@ def extract_video_info_from_json(self, json_data):
 
         # Extract the speaker of the TED talk
         if len(json_data["speakers"]):
-            if "nodes" in json_data["speakers"]:
-                speaker_info = json_data["speakers"]["nodes"][0]
-            else:
+            if isinstance(json_data["speakers"], dict):
+                speaker_info = (
+                    json_data["speakers"]["nodes"][0]
+                    if json_data["speakers"].get("nodes", [])
+                    else {}
+                )
+            elif isinstance(json_data["speakers"], list):
                 speaker_info = json_data["speakers"][0]
+            else:
+                raise IOError("Unexpected speaker JSON format: {}".format(json_data))
             speaker = " ".join(
                 [
                     speaker_info.get("firstame", ""),