[imagevenue] improve error for dead images (#8477)

gallery_dl/extractor/imagehosts.py

@@ -174,7 +174,11 @@ class ImagevenueImageExtractor(ImagehostImageExtractor):
     example = "https://www.imagevenue.com/ME123456789"
 
     def get_info(self, page):
-        pos = page.index('class="card-body')
+        try:
+            pos = page.index('class="card-body')
+        except ValueError:
+            raise exception.NotFoundError("image")
+
         url, pos = text.extract(page, '<img src="', '"', pos)
         if url.endswith("/loader.svg"):
             url, pos = text.extract(page, '<img src="', '"', pos)

test/results/imagevenue.py

@@ -5,6 +5,7 @@
 # published by the Free Software Foundation.
 
 from gallery_dl.extractor import imagehosts
+from gallery_dl import exception
 
 
 __tests__ = (
@@ -46,4 +47,12 @@ __tests__ = (
     "#sha1_content": "da39a3ee5e6b4b0d3255bfef95601890afd80709",
 },
 
+{
+    "#url"     : "http://img42.imagevenue.com/img.php?loc=loc1003%E2%84%91=20377_Alessandra_Ambrosio_Celebrity_City_Arriving_Mokai_Nightclub_17_13_1003lo.jpg",
+    "#comment" : "dead link / '404 Image Unavailable' redirect (#8477)",
+    "#category": ("imagehost", "imagevenue", "image"),
+    "#class"   : imagehosts.ImagevenueImageExtractor,
+    "#exception": exception.NotFoundError,
+},
+
 )