Fix conversion of bugged VTTs with missing styles

NBLA/__init__.py

@@ -60,6 +60,7 @@ class NebulaSubtitle(Subtitle):
 					bold = "bold" in extra
 					styles[name.lower()] = {"color": color, "bold": bold}
 
+
 		count = 1
 		new_subs = []
 		for caption in vtt:
@@ -68,18 +69,20 @@ class NebulaSubtitle(Subtitle):
 			for tag in soup.find_all("v"):
 				name = " ".join(tag.attrs.keys())
 
-				# Work around a few broken "Abolish Everything" subtitles
-				if ((name == "spectator" and "spectator" not in styles) or
-					(name == "spectators" and "spectators" not in styles)):
-					name = "audience"
+				# Nebula subtitles sometimes contain references to non-existent style groups, just
+				# remove the tag entirely in those cases
+				style = styles.get(name)
+				if not style:
+					tag.replaceWithChildren()
+					continue
 
-				style = styles[name]
 				tag.name = "font"
 				tag.attrs = {"color": style["color"]}
 
 				if style["bold"]:
 					tag.wrap(soup.new_tag("b"))
 
+
 			text = str(soup)
 			new_subs.append(f"{count}")
 			new_subs.append(f"{caption.start} --> {caption.end}")