Update db_operations/db_read.py

db_operations/db_read.py

@@ -37,7 +37,7 @@ class DBRead:
             rss_df = pd.DataFrame(docs)
         except Exception as insert_err:
             self.__error = 1
-            rss_df = None
+            rss_df = pd.DataFrame()
         return rss_df
 
     def __close_connection(self):
@@ -47,7 +47,7 @@ class DBRead:
 
     def read_news_from_db(self):
         logger.warning('Entering read_news_from_db() to read old news')
-        rss_df = None
+        rss_df = pd.DataFrame()
         if self.url is not None:
             if self.__error == 0:
                 self.__connect()
@@ -58,4 +58,6 @@ class DBRead:
             if self.__client is not None:
                 self.__close_connection()
         logger.warning('Entering read_news_from_db()')
+        if len(rss_df) == 0:
+            rss_df = None
         return rss_df