fix: External API fallback flow and conditional NFO creation

Fixed two critical issues:
1. External API fallback was never reached because early returns when series/episodes not found in Sonarr
2. tvshow.nfo and season.nfo were always created even if they already existed

Changes:
- Restructured Sonarr lookup to fall through to external APIs when series/episodes not found
- Made tvshow.nfo and season.nfo creation conditional (only if files don't exist)
- Added debug logging for skipped NFO creation
- Version bump to 2.0.4-fallback-fix

Now series like High Potential should properly fall back to TMDB/OMDb for episode airdates.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

VERSION

@@ -1 +1 @@
-2.0.3-external-fallback
+2.0.4-fallback-fix

processors/tv_series_processor.py

@@ -191,8 +191,9 @@ class TVSeriesProcessor:
             series = self.sonarr.series_by_imdb(imdb_id)
             if not series:
                 _log("WARNING", f"Series not found in Sonarr for IMDb: {imdb_id}")
-                return aired, dateadded, source
+                # Don't return here - fall through to external API fallback
-            
+                pass
+            else:
                 # Get episodes for series
                 episodes = self.sonarr.episodes_for_series(series["id"])
                 target_episode = None
@@ -205,8 +206,8 @@ class TVSeriesProcessor:
                 
                 if not target_episode:
                     _log("WARNING", f"Episode S{season_num:02d}E{episode_num:02d} not found in Sonarr")
-                return aired, dateadded, source
+                    # Don't return here - fall through to external API fallback
-            
+                else:
                     # Get airdate
                     aired = target_episode.get("airDateUtc")
                     
@@ -317,13 +318,21 @@ class TVSeriesProcessor:
         return None, "no_external_data"
     
     def _create_series_nfos(self, series_path: Path, imdb_id: str):
-        """Create tvshow.nfo and season.nfo files"""
+        """Create tvshow.nfo and season.nfo files only if they don't exist"""
-        # Create tvshow.nfo
+        # Create tvshow.nfo only if it doesn't exist
+        tvshow_nfo = series_path / "tvshow.nfo"
+        if not tvshow_nfo.exists():
             self.nfo_manager.create_tvshow_nfo(series_path, imdb_id)
+        else:
+            _log("DEBUG", f"Skipping tvshow.nfo creation - already exists: {tvshow_nfo}")
         
-        # Create season.nfo for each season directory
+        # Create season.nfo for each season directory only if they don't exist
         for season_dir in series_path.iterdir():
             if season_dir.is_dir() and self._is_season_directory(season_dir.name):
                 season_num = self._extract_season_number(season_dir.name)
                 if season_num is not None:
+                    season_nfo = season_dir / "season.nfo"
+                    if not season_nfo.exists():
                         self.nfo_manager.create_season_nfo(season_dir, season_num)
+                    else:
+                        _log("DEBUG", f"Skipping season.nfo creation - already exists: {season_nfo}")