flatten: Fix combination of --use-titles and --rolup with a value on CLI

#359

Author: Bjwebb

examples/flatten/rollup/badschema/expected/cafe.csv

@@ -1,3 +1,3 @@
-Identifier,Type,Name,Address,Coffee quality,Type of coke
-1,cafe,Cafe Open,,passable,
-2,pub,Pints R Us,,,pepsi
+Identifier,Type,Name,Address,Coffee quality,Type of coke,Owner:First name,Owner:Last name,Owner:Email
+1,cafe,Cafe Open,,passable,,Clark,Kent,[email protected]
+2,pub,Pints R Us,,,pepsi,Jim,Kirk,[email protected]

flattentool/json_input.py

@@ -403,11 +403,15 @@ def parse_json_dict(
                                         elif (
                                             self.use_titles
                                             and parent_name + key in self.rollup
-                                            and parent_name + key
+                                            and self.schema_parser.sub_sheet_titles.get(
+                                                (parent_name, key,)
+                                            )
                                             in self.schema_parser.sub_sheets
                                         ):
                                             relevant_subsheet = self.schema_parser.sub_sheets.get(
-                                                parent_name + key
+                                                self.schema_parser.sub_sheet_titles.get(
+                                                    (parent_name, key,)
+                                                )
                                             )
                                             if relevant_subsheet is not None:
                                                 rollup_field_title = sheet_key_title(