[civitai] update "My Reactions" handling (#6263)

- use "reactions" subcategory
- raise exception when no api-key or cookies are present

test/results/civitai.py

@@ -5,6 +5,7 @@
 # published by the Free Software Foundation.
 
 from gallery_dl.extractor import civitai
+from gallery_dl import exception
 
 
 __tests__ = (
@@ -177,14 +178,23 @@ __tests__ = (
 },
 
 {
-    "#url"  : "https://civitai.com/user/USER/images?section=reactions",
-    "#class": civitai.CivitaiUserImagesExtractor,
-    "#auth" : True,
-    "#urls" : (
+    "#url"     : "https://civitai.com/user/USER/images?section=reactions",
+    "#category": ("", "civitai", "reactions"),
+    "#class"   : civitai.CivitaiUserImagesExtractor,
+    "#auth"    : True,
+    "#urls"    : (
         "https://image.civitai.com/xG1nkqKTMzGDvpLrqFT7WA/dd29c97a-1e95-4186-8df5-632736cbae79/original=true/00012-2489035818.png",
         "https://image.civitai.com/xG1nkqKTMzGDvpLrqFT7WA/5c4efa68-bb58-47c5-a716-98cd0f51f047/original=true/00013-4238863814.png",
         "https://image.civitai.com/xG1nkqKTMzGDvpLrqFT7WA/69bf3279-df2c-4ec8-b795-479e9cd3db1b/original=true/00014-3150861441.png",
     ),
 },
 
+{
+    "#url"     : "https://civitai.com/user/USER/images?section=reactions",
+    "#category": ("", "civitai", "reactions"),
+    "#class"   : civitai.CivitaiUserImagesExtractor,
+    "#auth"     : False,
+    "#exception": exception.AuthorizationError,
+},
+
 )