allow empty frame

[WangPengZhan]

ldf:

Frames {
	CcsmIhu_Lin2Fr01: 0x08, MENTOR_XXX, 5 {
	}
	CcsmIhu_Lin2Fr04: 0x03, MENTOR_XXX, 7 {
	}
	CdrmIhu_Lin2Fr01: 0x0B, MENTOR_XXX, 2 {
	}
	CdrmIhu_Lin2PartNrFr01: 0x16, MENTOR_XXX, 8 {
	}
	CdrmIhu_Lin2PartNrFr02: 0x11, MENTOR_XXX, 7 {
	}
	CdrmIhu_Lin2SerNrFr01: 0x12, MENTOR_XXX, 4 {
	}
	DmsmIhu_Lin2Fr01: 0x01, MENTOR_XXX, 8 {
	}
	RcsmIhu_Lin2Fr01: 0x02, MENTOR_XXX, 4 {
	}
	RcsmIhu_Lin2Fr02: 0x3A, MENTOR_XXX, 7 {
	}
	RcsmIhu_Lin2PartNrFr04: 0x0C, MENTOR_XXX, 8 {
	}
	RcsmIhu_Lin2PartNrFr08: 0x2C, MENTOR_XXX, 7 {
	}
	RcsmIhu_Lin2SerNrFr01: 0x06, MENTOR_XXX, 4 {
	}
	ScplIhu_Lin2Fr01: 0x1F, MENTOR_XXX, 8 {
	}
	ScprIhu_Lin2Fr01: 0x0F, MENTOR_XXX, 8 {
	}
	TcplIhu_Lin2Fr01: 0x1E, MENTOR_XXX, 4 {
	}
	TcprIhu_Lin2Fr01: 0x13, MENTOR_XXX, 4 {
	}
	TCSIhu_Lin1Fr01: 0x05, MENTOR_XXX, 4 {
	}
}

error log

  File "/usr/local/lib/python3.10/dist-packages/ldfparser/parser.py", line 36, in parse_ldf_to_dict
    tree = parser.parse(ldf_file)
  File "/home/iveswang/.local/lib/python3.10/site-packages/lark/lark.py", line 655, in parse
    return self.parser.parse(text, start=start, on_error=on_error)
  File "/home/iveswang/.local/lib/python3.10/site-packages/lark/parser_frontends.py", line 104, in parse
    return self.parser.parse(stream, chosen_start, **kw)
  File "/home/iveswang/.local/lib/python3.10/site-packages/lark/parsers/lalr_parser.py", line 42, in parse
    return self.parser.parse(lexer, start)
  File "/home/iveswang/.local/lib/python3.10/site-packages/lark/parsers/lalr_parser.py", line 88, in parse
    return self.parse_from_state(parser_state)
  File "/home/iveswang/.local/lib/python3.10/site-packages/lark/parsers/lalr_parser.py", line 111, in parse_from_state
    raise e
  File "/home/iveswang/.local/lib/python3.10/site-packages/lark/parsers/lalr_parser.py", line 100, in parse_from_state
    for token in state.lexer.lex(state):
  File "/home/iveswang/.local/lib/python3.10/site-packages/lark/lexer.py", line 674, in lex
    raise UnexpectedToken(token, e.allowed, state=parser_state, token_history=[last_token], terminals_by_name=self.root_lexer.terminals_by_name)
lark.exceptions.UnexpectedToken: Unexpected token Token('RBRACE', '}') at line 105, column 2.
Expected one of: 
        * CNAME
Previous tokens: [Token('LBRACE', '{')]