fix bug #502 (#504)

### What problem does this PR solve?

#502 
### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

docker/entrypoint.sh

@@ -23,7 +23,6 @@ function watch_broker(){
 }
 
 function task_bro(){
-    sleep 160;
     watch_broker;
 }
 

rag/app/paper.py

@@ -78,7 +78,7 @@ class Pdf(PdfParser):
         title = ""
         authors = []
         i = 0
-        while i < min(32, len(self.boxes)):
+        while i < min(32, len(self.boxes)-1):
             b = self.boxes[i]
             i += 1
             if b.get("layoutno", "").find("title") >= 0: