[warosu] fix crash for threads with deleted posts (#5289)

gallery_dl/extractor/warosu.py

@@ -64,8 +64,7 @@ def posts(self, page):
     def parse(self, post):
         """Build post object by extracting data from an HTML post"""
         data = self._extract_post(post)
-        if "<span> File:" in post:
-            self._extract_image(post, data)
+        if "<span> File:" in post and self._extract_image(post, data):
             part = data["image"].rpartition("/")[2]
             data["tim"], _, data["extension"] = part.partition(".")
             data["ext"] = "." + data["extension"]
@@ -91,6 +90,11 @@ def _extract_image(self, post, data):
             "", "<").rstrip().rpartition(".")[0])
         extr("<br>", "")
 
-        data["image"] = url = extr("<a href=", ">")
-        if url[0] == "/":
-            data["image"] = self.root + url
+        url = extr("<a href=", ">")
+        if url:
+            if url[0] == "/":
+                data["image"] = self.root + url
+            else:
+                data["image"] = url
+            return True
+        return False

test/results/warosu.py

@@ -54,6 +54,18 @@
     "w"         : 450,
 },
 
+{
+    "#url"     : "https://warosu.org/jp/thread/45886210",
+    "#comment" : "deleted post (#5289)",
+    "#category": ("", "warosu", "thread"),
+    "#class"   : warosu.WarosuThreadExtractor,
+    "#count"   : "> 150",
+
+    "board"     : "jp",
+    "board_name": "Otaku Culture",
+    "title"     : "/07/th Expansion Thread",
+},
+
 {
     "#url"     : "https://warosu.org/ic/thread/4604652",
     "#category": ("", "warosu", "thread"),