<v1.4> fish_project，修改 init_project_by_yml 方法：

[halfapple]

try:
    from yaml import CLoader as Loader, CDumper as Dumper
except ImportError:
    from yaml import Loader, Dumper

try:
    yml_data = yaml.load(project_config, Loader=Loader)
    if not yml_data or type(yml_data) != dict:
        raise RuntimeError('fail to load')
    project_name = yml_data['project']
    project_tree = yml_data['tree']
except Exception as e:
    raise KeyError('project config format Error: {}'.format(e))

增加安全检查，增加对应的 ut

[coveralls]

Pull Request Test Coverage Report for Build 709

• 84 of 84 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.7%) to 95.383%

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Totals
Change from base Build 702:	0.7%
Covered Lines:	971
Relevant Lines:	1018

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💛 - Coveralls