From 845acfe1ac7c156513d928b01e4acdad0c47f6ee Mon Sep 17 00:00:00 2001
From: MinchinWeb <w_minchin@hotmail.com>
Date: Mon, 7 Jun 2021 21:46:15 -0600
Subject: [PATCH] Allow easy subclassing of Writer

When you write a custom Writer, it gets called with `settings=None`. If you writer is simply a subclass of the built-in Writer, Pelican will through the error `CRITICAL: 'RELATIVE_URLS'`.

The source of the error is from `Pelican._get_writer()` in `__init__.py`.
---
 pelican/writers.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pelican/writers.py b/pelican/writers.py
index 73f025b6..73ee4b33 100644
--- a/pelican/writers.py
+++ b/pelican/writers.py
@@ -25,7 +25,7 @@ class Writer:
         self._overridden_files = set()
 
         # See Content._link_replacer for details
-        if self.settings['RELATIVE_URLS']:
+        if "RELATIVE_URLS" in self.settings and self.settings['RELATIVE_URLS']:
             self.urljoiner = posix_join
         else:
             self.urljoiner = lambda base, url: urljoin(