[nijie] fix image URL for single image posts (#5049)

gallery_dl/extractor/nijie.py

@@ -116,7 +116,8 @@ class NijieExtractor(AsynchronousMixin, BaseExtractor):
             yield from text.extract_iter(
                 page, 'href="javascript:void(0);"><img src="', '"')
         else:
-            yield text.extr(page, 'itemprop="image" src="', '"')
+            pos = page.find('id="view-center"') + 1
+            yield text.extract(page, 'itemprop="image" src="', '"', pos)[0]
 
     @staticmethod
     def _extract_user_name(page):

test/results/nijie.py

@@ -157,6 +157,14 @@ __tests__ = (
     "user_name"  : "黒川　竜",
 },
 
+{
+    "#url"     : "https://nijie.info/view.php?id=37078",
+    "#comment" : "'view_side_dojin' thumbnails (#5049)",
+    "#category": ("Nijie", "nijie", "image"),
+    "#class"   : nijie.NijieImageExtractor,
+    "#urls"    : "https://pic.nijie.net/03/nijie/13/98/498/illust/0_0_703023d18ca8d058_bca943.jpg",
+},
+
 {
     "#url"     : "https://nijie.info/view.php?id=70724",
     "#category": ("Nijie", "nijie", "image"),