Make download_chart function robust for its own Review App
Make download_chart function robust for its own Review App

Signed-off-by: Takuya Noguchi <b6ff22f4ae6fe3ca1371a0ef8d104f1c4bca551b@gmail.com>

stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq