Updated .gitignore to include key and build files

.gitignore

@@ -0,0 +1,5 @@
+key
+/app.db
+/key
+/migrations/*
+/venv/*

app/models.py

@@ -15,6 +15,8 @@ class User(UserMixin, db.Model):
         self.password_hash = generate_password_hash(password)
 
     def check_password(self, password):
+        if self.password_hash is None:
+            raise "{} has no password_hash set!".format(self.__repr__())
         return check_password_hash(self.password_hash, password)
 
     def __repr__(self):