remove unreachable error code

src/signup.rs

@@ -21,7 +21,7 @@ pub(crate) const CREATE_QUERY: &str =
 const ID_QUERY: &str = "select * from witches where id = $1";
 
 //-************************************************************************
-// Result types for user creation
+// Error types for user creation
 //-************************************************************************
 
 #[Error(desc = "Could not create user.")]
@@ -51,7 +51,6 @@ pub enum CreateUserErrorKind {
     #[error(desc = "Display name must be less than 100 characters long")]
     BadDisplayname,
     BadEmail,
-    MissingFields,
     UnknownDBError,
 }