Allow empty classdef or methods/properties/... blocks * oct-parse.in.yy (rule classdef): Add variant without body. (rule properties_block, rule methods_block, rule events_block, rule rnum_block): Add empty variant. (octave_base_parser::make_classdef): Handle case with NULL body. (octave_base_parser::make_classdef_properties_block): Handle case with NULL properties list. (octave_base_parser::make_classdef_methods_block): Handle case with NULL methods list. (octave_base_parser::make_classdef_events_block): Handle case with NULL events list. (octave_base_parser::make_classdef_enum_block): Handle case with NULL enum list.

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