fix: return None if remote image length is unavailable (#370)

When this plugin is run on a doc site that also uses the social plugin,
fetching remote image data can fail. This results in a crash when
building the documentation:

File
"/path/installs/python/3.11.5/lib/python3.11/site-packages/mkdocs_rss_plugin/util.py",
line 608, in get_image
        img_length = self.get_remote_image_length(image_url=img_url)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/path/installs/python/3.11.5/lib/python3.11/site-packages/mkdocs_rss_plugin/util.py",
line 710, in get_remote_image_length
        return int(img_length)
               ^^^^^^^^^^^^^^^
TypeError: int() argument must be a string, a bytes-like object or a
real number, not 'NoneType'

This patch simply returns None if `img_length` is `None.`

Closes: #369
Closes: #353

Author: Guts

mkdocs_rss_plugin/util.py

@@ -126,8 +126,7 @@ def __init__(
         else:
             self.git_is_valid = False
             logger.debug(
-                "Git use is disabled. "
-                "Only page.meta (YAML frontmatter will be used). "
+                "Git use is disabled. Only page.meta (YAML frontmatter will be used). "
             )
 
         # save git enable/disable status
@@ -707,7 +706,7 @@ def get_remote_image_length(
                 )
                 return None
 
-        return int(img_length)
+        return int(img_length) if img_length else None
 
     @staticmethod
     def get_site_url(mkdocs_config: MkDocsConfig) -> Optional[str]: