Update download_videos to handle too many redirects and missing conte…

…nt-type

processors/visualisation/download_videos.py

@@ -388,7 +388,7 @@ def dmi_match_filter(vid_info, *, incomplete):
                 }]
                 success = True
                 self.videos_downloaded_from_url = 1
-            except (requests.exceptions.Timeout, requests.exceptions.SSLError, requests.exceptions.ConnectionError, FilesizeException, FailedDownload, NotAVideo) as e:
+            except (requests.exceptions.Timeout, requests.exceptions.SSLError, requests.exceptions.ConnectionError, requests.exceptions.TooManyRedirects, FilesizeException, FailedDownload, NotAVideo) as e:
                 # FilesizeException raised when file size is too large or unknown filesize (and that is disabled in 4CAT settings)
                 # FailedDownload raised when response other than 200 received
                 # NotAVideo raised due to specific Content-Type known to not be a video (and not a webpage/html that could lead to a video via YT-DLP)
@@ -570,9 +570,12 @@ def download_video_with_requests(self, url, results_path, max_video_size, retrie
                 # Verify video
                 # YT-DLP will download images; so we raise them differently
                 # TODO: test/research other possible ways to verify video links; watch for additional YT-DLP oddities
-                if "image" in response.headers["Content-Type"].lower():
+                content_type = response.headers.get("Content-Type")
+                if not content_type:
+                    raise VideoStreamUnavailable(f"Unable to verify video; no Content-Type provided: {url}")
+                elif "image" in content_type.lower():
                     raise NotAVideo("Not a Video (%s): %s" % (response.headers["Content-Type"], url))
-                elif "video" not in response.headers["Content-Type"].lower():
+                elif "video" not in content_type.lower():
                     raise VideoStreamUnavailable(f"Does not appear to be a direct to video link: {url}; "
                                                  f"Content-Type: {response.headers['Content-Type']}")