[pixiv] detect suspended/deleted accounts (#7990)

test/results/pixiv.py

@@ -136,6 +136,7 @@ __tests__ = (
     "#comment" : "deleted account with a different error",
     "#class"   : pixiv.PixivArtworksExtractor,
     "#log"     : "'User has left pixiv or the user ID does not exist.'",
+    "#exception": exception.NotFoundError,
 },
 
 {
@@ -175,6 +176,13 @@ __tests__ = (
     "#class"   : pixiv.PixivArtworksExtractor,
 },
 
+{
+    "#url"      : "https://www.pixiv.net/users/70060776/artworks",
+    "#comment"  : "suspended account (#7990)",
+    "#class"    : pixiv.PixivArtworksExtractor,
+    "#exception": exception.NotFoundError,
+},
+
 {
     "#url"     : "https://www.pixiv.net/en/users/173530/avatar",
     "#class"   : pixiv.PixivAvatarExtractor,