Adding an if statement to prevent an exception when closing a file that is not opened (#184)

databuilder/loader/file_system_csv_loader.py

@@ -48,7 +48,8 @@ class FileSystemCSVLoader(Loader):
         :return:
         """
         try:
-            self.file_handler.close()
+            if self.file_handler:
+                self.file_handler.close()
         except Exception as e:
             logging.warning("Failed trying to close a file handler! %s",
                             str(e))

databuilder/loader/file_system_elasticsearch_json_loader.py

@@ -62,7 +62,8 @@ class FSElasticsearchJSONLoader(Loader):
         close the file handler
         :return:
         """
-        self.file_handler.close()
+        if self.file_handler:
+            self.file_handler.close()
 
     def get_scope(self):
         # type: () -> str