404 for missing user

app.py

@@ -438,6 +438,8 @@ def logout():

                                
                                
                                
                            
                                
                                    
                                        
                                            438  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            439  
                                            @app.route("/<username>/", methods=["GET", "POST"])
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            440  
                                            def user_profile(username):
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        441 +
                                            if db.session.get(User, username) is None:
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        442 +
                                                flask.abort(404)
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            443  
                                                old_relationship = UserFollow.query.filter_by(
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            444  
                                                        follower_username=flask.session.get("username"),
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            445  
                                                        followed_username=username).first()