Try destructing the hachoir objects as soon as possible, to hopefully ensure...

Try destructing the hachoir objects as soon as possible, to hopefully ensure the file is closed before pp file operations
SiCKRAGETV/sickrage-issues#2534

sickbeard/common.py

@@ -275,7 +275,12 @@ class Quality:
         from hachoir_parser import createParser
         from hachoir_metadata import extractMetadata
 
+        try:
             parser = createParser(filename)
+        except Exception:
+            parser = None
+            pass
+
         if not parser:
             return Quality.UNKNOWN
 
@@ -285,6 +290,8 @@ class Quality:
             metadata = None
             pass
 
+        del parser
+
         if not metadata:
             return Quality.UNKNOWN
 
@@ -298,6 +305,8 @@ class Quality:
                     if metagroup.has('height'):
                         height = int(metagroup.get('height') or 0)
 
+        del metadata
+
         if not height:
             return Quality.UNKNOWN