Fix crash on mentioning user

app/blueprints/threads/__init__.py

@@ -240,7 +240,7 @@ def view(id):
 			thread.watchers.append(current_user)
 
 		for mentioned_username in get_user_mentions(render_markdown(comment)):
-			mentioned = User.query.filter_by(username=mentioned_username)
+			mentioned = User.query.filter_by(username=mentioned_username).first()
 			if mentioned is None:
 				continue
 
@@ -343,7 +343,7 @@ def new():
 			package.review_thread = thread
 
 		for mentioned_username in get_user_mentions(render_markdown(form.comment.data)):
-			mentioned = User.query.filter_by(username=mentioned_username)
+			mentioned = User.query.filter_by(username=mentioned_username).first()
 			if mentioned is None:
 				continue
 

app/blueprints/users/profile.py

@@ -66,6 +66,9 @@ class Medal:
 
 	@classmethod
 	def make_locked(cls, description: str, progress: Tuple[int, int]):
+		if progress[0] is None or progress[1] is None:
+			raise Exception("Invalid progress")
+
 		return Medal(description=description, progress=progress)
 
 
@@ -127,7 +130,7 @@ def get_user_medals(user: User) -> Tuple[List[Medal], List[Medal]]:
 
 		unlocked.append(Medal.make_unlocked(
 				place_to_color(review_idx + 1), "fa-star-half-alt", title, description))
-	else:
+	elif review_boundary is not None:
 		description = gettext(u"Consider writing more helpful reviews to get a medal.")
 		if review_idx:
 			description += " " + gettext(u"You are in place %(place)s.", place=review_idx + 1)

app/templates/macros/threads.html

@@ -162,6 +162,11 @@
 					<input class="btn btn-primary" type="submit" value="Comment" />
 				</form>
 			{% endif %}
+			{% if thread.private %}
+				<p class="text-muted card-body my-0 pt-0">
+					{{ _("You can add someone to a private thread by writing @username.") }}
+				</p>
+			{% endif %}
 		</div>
 	</div>
 </div>