Replace LOGGER.error by LOGGER.warning for catchable errors

patacrep/content/__init__.py

@@ -145,7 +145,7 @@ def render(context, content):
     last = None
     for elem in content:
         if not isinstance(elem, Content):
-            LOGGER.error("Ignoring bad content item '{}'.".format(elem))
+            LOGGER.warning("Ignoring bad content item '{}'.".format(elem))
             continue
 
         last = elem

patacrep/content/include.py

@@ -50,8 +50,8 @@ def parse(keyword, config, argument, contentlist):
                 ) as content_file:
                 new_content = json.load(content_file)
         except Exception as error: # pylint: disable=broad-except
-            LOGGER.error(error)
-            LOGGER.error("Error while loading file '{}'.".format(filepath))
+            LOGGER.warning(error)
+            LOGGER.warning("Error while loading file '{}'.".format(filepath))
             sys.exit(1)
 
         config["datadir"].append(os.path.abspath(os.path.dirname(filepath)))