API: 404 is returned for some endpoints but not others

[hugovk]

For packages with zero downloads, these return 404:

• https://pypistats.org/api/packages/sugar/recent
• https://pypistats.org/api/packages/sugar/overall

However, these return data but with empty data:

https://pypistats.org/api/packages/sugar/python_major
https://pypistats.org/api/packages/sugar/python_minor
https://pypistats.org/api/packages/sugar/system

{
"data": [],
"package": "sugar",
"type": "python_major_downloads"
}

{
"data": [],
"package": "sugar",
"type": "python_minor_downloads"
}	

{
"data": [],
"package": "sugar",
"type": "system_downloads"
}

Similarly, for packages which don't exist:

https://pypistats.org/api/packages/notfound123444/recent
https://pypistats.org/api/packages/notfound123444/overall

These return "data": []:

https://pypistats.org/api/packages/notfound123444/python_major
https://pypistats.org/api/packages/notfound123444/python_minor
https://pypistats.org/api/packages/notfound123444/system

Should they all return 404?