[api] fix: crashing when trying to retrieve a file size without proving its URL

CHANGELOG.md

@@ -8,6 +8,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixes
 - General
   - more fixes related to some backend commands hanging
+  - crashing when trying to retrieve a file size without proving its URL [#207](https://github.com/vinifmor/bauh/issues/207)
+  
 - Flatpak
   - not displaying update components not associated with installed packages 
   - not displaying the updates size for Flatpak 1.2

bauh/api/http.py

@@ -69,6 +69,9 @@ class HttpClient:
         return yaml.safe_load(res.text) if res else None
 
     def get_content_length_in_bytes(self, url: str, session: bool = True) -> Optional[int]:
+        if not url:
+            return None
+
         params = {'url': url, 'allow_redirects': True, 'stream': True}
 
         try: