[kemono] prevent fatal exception when retrieving profile data (#8382)

test/results/kemono.py

@@ -5,7 +5,7 @@
 # published by the Free Software Foundation.
 
 from gallery_dl.extractor import kemono
-from gallery_dl import exception
+from gallery_dl import util, exception
 
 
 __tests__ = (
@@ -531,6 +531,23 @@ __tests__ = (
     }],
 },
 
+{
+    "#url"     : "https://kemono.cr/patreon/user/34792417/post/137409895",
+    "#comment" : "user profile data unavailable (#8382)",
+    "#category": ("", "kemono", "patreon"),
+    "#class"   : kemono.KemonoPostExtractor,
+    "#log"     : "patreon/34792417/137409895: 'Creator not found'",
+    "#results" : (
+        "https://kemono.cr/data/a9/87/a9874d7e1229396b0b2706fd7fa9949eac924e86256d84d077c10ecbace8bd17.bin",
+        "https://kemono.cr/data/a2/eb/a2eba02204086c789d59bc7112510aebf0428455ad1664153bfbb92eb8aa5643.jpg",
+    ),
+
+    "title"       : "Capella - Re:zero (20P)",
+    "user"        : "34792417",
+    "user_profile": util.NONE,
+    "username"    : util.NONE,
+},
+
 {
     "#url"     : "https://kemono.cr/discord/server/488668827274444803/608504710906904576",
     "#category": ("", "kemono", "discord"),