Fix missing group_by default value in string_matching macros #126
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Fix for issue #125.
Problem: All the methods in macros/schema_tests/string_matching/ define a group_by_columns=group_by functionality, but group_by is not defined in the method which makes them fail with 'MacroGenerator' object is not iterable.
Solution: we set group_by = None as it's not used by the method.