fix(roles): Map IntegrityError to BadRequest as this is an client error, no server error.

flaschengeist/controller/roleController.py

@@ -17,7 +17,7 @@ def get(role_name) -> Role:
     else:
         role = Role.query.filter(Role.name == role_name).one_or_none()
     if not role:
-        raise NotFound
+        raise NotFound("no such role")
     return role
 
 
@@ -56,11 +56,14 @@ def create_permissions(permissions):
 
 def create_role(name: str, permissions=[]):
     logger.debug(f"Create new role with name: {name}")
+    try:
         role = Role(name=name)
         db.session.add(role)
         set_permissions(role, permissions)
         db.session.commit()
         logger.debug(f"Created role: {role.serialize()}")
+    except IntegrityError:
+        raise BadRequest("role already exists")
     return role