When "bl_info" was on the first line, the legacy add-on would not install. Correct the check which would also incorrectly detect legacy add-ons when "bl_info" wasn't found at all.
When "bl_info" was on the first line, the legacy add-on would not install. Correct the check which would also incorrectly detect legacy add-ons when "bl_info" wasn't found at all.