Fix context menu behavior

lector/parsers/pdf.py

@@ -18,6 +18,7 @@
 
 import io
 import os
+
 from PyQt5 import QtCore
 from bs4 import BeautifulSoup
 
@@ -28,6 +29,7 @@ except ImportError:
     print('python-poppler-qt5 is not installed. Pdf files will not work.')
     proceed = False
 
+
 class ParsePDF:
     def __init__(self, filename, *args):
         self.filename = filename