fix(api): add missing return in info_file after exhausted loop

Prevent implicit None return when no data row matches the expected
transmission-remote --info-files format. Also clarify README macOS
install note.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -77,7 +77,7 @@ sudo apt-get install -y p7zip-full transmission-daemon
 
 macOS (Homebrew):
 ```bash
-brew install p7zip transmission-cli
+brew install p7zip transmission-cli  # provides transmission-daemon and transmission-remote
 ```
 
 Then install the Python dependencies and CLI shim:

hate_crack/api.py

@@ -461,6 +461,7 @@ class TransmissionSession:
                 if len(tokens) == 2:
                     return tokens[1]
                 return rest
+            return ""
         except Exception:
             return ""