various fixes

#459

Author: fchapoton

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 - Some typos in docs, comments and examples
 - Put back some translations that were removed
+- Minor python tidyups
 - Avoid deprecation warning from the ijson package.  https://github.com/OpenDataServices/flatten-tool/pull/458
 
 ### Removed

flattentool/cli.py

@@ -364,7 +364,7 @@ def main():
         try:
             # Note: Ensures that empty arguments are not passed to the create_template function
             create_template(**kwargs_from_parsed_args(args))
-        except (OSError, IOError) as e:
+        except OSError as e:
             print(str(e))
             return
     elif args.subparser_name == "flatten":

flattentool/input.py

@@ -731,7 +731,7 @@ def read_sheets(self):
         for sheet in self.exclude_sheets or []:
             self.sheet_names_map.pop(sheet, None)
 
-        sheet_names = list(sheet for sheet in self.sheet_names_map.keys())
+        sheet_names = list(self.sheet_names_map.keys())
         self.sub_sheet_names = sheet_names
         self.configure_sheets()