[hentainexus] fix error for spread pages (#5827)

gallery_dl/extractor/hentainexus.py

@@ -70,10 +70,13 @@ class HentainexusGalleryExtractor(GalleryExtractor):
             for img in imgs:
                 img["_http_headers"] = headers
 
-        return [
-            (img["image"], img)
-            for img in imgs
-        ]
+        results = []
+        for img in imgs:
+            try:
+                results.append((img["image"], img))
+            except KeyError:
+                pass
+        return results
 
     @staticmethod
     def _decode(data):

test/results/hentainexus.py

@@ -40,6 +40,7 @@ __tests__ = (
         "kimono",
         "pubic hair",
         "uncensored",
+        "unlimited",
         "vanilla",
     ],
     "title"      : "Graduation!",
@@ -54,6 +55,14 @@ __tests__ = (
     "#class"   : hentainexus.HentainexusGalleryExtractor,
 },
 
+{
+    "#url"     : "https://hentainexus.com/view/715",
+    "#comment" : "combined left-right pages (#5827)",
+    "#category": ("", "hentainexus", "gallery"),
+    "#class"   : hentainexus.HentainexusGalleryExtractor,
+    "#count"   : 2,
+},
+
 {
     "#url"     : "https://hentainexus.com/?q=tag:%22heart+pupils%22%20tag:group",
     "#category": ("", "hentainexus", "search"),