Fix reddit album parsing. (#200)

* Update redditelement.py

* Pin (most) requirements.

* Update requirements.txt

redditdownloader/processing/wrappers/redditelement.py

@@ -129,7 +129,7 @@ def _submission(self, post):
 			# This post probably doesn't have a URL, and has selftext instead.
 			for url in stringutil.html_elements(post.selftext_html, 'a', 'href'):
 				self.add_url(url)
-		if getattr(post, 'is_gallery', False):
+		if getattr(post, 'is_gallery', False) and getattr(post, 'media_metadata', False):
 			for k, img in post.media_metadata.items():
 				try:
 					self.add_url(img['s']['u'])
@@ -154,7 +154,7 @@ def _ps_submission(self, post):
 		self.num_comments = post.num_comments
 		self.score = post.score
 		self.body = html.unescape(str(post.selftext)) if 'selftext' in post and post.selftext else ''
-		if getattr(post, 'is_gallery', False):
+		if getattr(post, 'is_gallery', False) and getattr(post, 'media_metadata', False):
 			for k, img in post.media_metadata.items():
 				try:
 					self.add_url(html.unescape(img['s']['u']))

requirements.txt

@@ -3,12 +3,12 @@ youtube_dl
 imgurpython==1.1.7
 requests>=2.22.0
 sqlalchemy==1.3.23
-praw>=7.2.0
-lxml>=3.6.0
+praw==7.2.0
+lxml==4.6.3
 newspaper3k==0.2.8
 beautifulsoup4==4.7.1
 colorama==0.4.1
-Pillow==7.1.0
+Pillow==8.1.1
 pathvalidate==0.28.1
 eel==0.11.1
 twitter-text-python==1.1.1