Ensure pre-processor errors do not block --print

Closes #6937

yt_dlp/YoutubeDL.py

@@ -3489,8 +3489,10 @@ class YoutubeDL:
         return infodict
 
     def run_all_pps(self, key, info, *, additional_pps=None):
+        try:
             for pp in (additional_pps or []) + self._pps[key]:
                 info = self.run_pp(pp, info)
+        finally:
             if key != 'video':
                 self._forceprint(key, info)
         return info