Only warn about no content-type if there is a response body

src/surykatka/bot.py

@@ -720,13 +720,21 @@ class WebBot:
                         "Content-Type"
                         not in network_change["http_header_dict"]
                     ):
-                        result_dict["warning"].append(
-                            {
-                                "text": "(No Content-Type header) %s"
-                                % (network_change["url"],),
-                                "date": result_dict["bot_status"][0]["date"],
-                            }
-                        )
+                        if (
+                            network_change["http_header_dict"].get(
+                                "Content-Length", 0
+                            )
+                            != 0
+                        ):
+                            result_dict["warning"].append(
+                                {
+                                    "text": "(No Content-Type header) %s"
+                                    % (network_change["url"],),
+                                    "date": result_dict["bot_status"][0][
+                                        "date"
+                                    ],
+                                }
+                            )
                     elif network_change["http_header_dict"][
                         "Content-Type"
                     ].startswith("text/html"):