Fix minor errors in the new thumbnail stuff was stopping stuff from being inserted

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

chanbans/__main__.py

@@ -135,23 +135,27 @@ async def main():
         if 'thumb' in post:
             thumb_path = Path(THUMBS_DIR, f"{post['thumb']}s.jpg")
             download_jobs += [get_thumb(thumb_path, post)]
+        else:
+            thumb_path = ""
 
         # Try to create post in database
         try:
             with db:
                 curs = db.execute(
-                    "insert into bans (action, board, length, post, thumb_path, reason) values(?, ?, ?, ?, ?)",
+                    "insert into bans (action, board, length, post, thumb_path, reason) values(?, ?, ?, ?, ?, ?)",
                     (
                         cols["action"],
                         cols["board"],
                         cols["length"],
                         json.dumps(cols["post"]),
-                        cols["thumb_path"],
+                        str(thumb_path),
                         cols["reason"],
                     ),
                 )
-        except:
-            pass
+        except Exception as ex:
+            msg = str(ex)
+            if 'UNIQUE' not in msg:
+                print("error:", ex)
     # Finish off thumbnail jobs
     await asyncio.gather(*download_jobs)