errNoAvailableYet wait mechanism doesn't work(got panic)

[Allyin]

Hello.

In my knowledge, errNoAvailableYet occur when the the time of the current package is large than (T-59m).

This will definitely happen because the seed generation time is 1 minute, but the polling time is 20s.

When the time occurs, code should wait for the seed to be generated, but the program will panic directly.

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x40 pc=0xee9164]

goroutine 117 [running]:
github.com/VirusTotal/vt-go.(*Feed).getObjects(0xc000410e00, 0xc013b3ce70, 0xc, 0x0, 0x0, 0x0, 0x0, 0x0)
        /root/go/pkg/mod/github.com/!virus!total/vt-go@v0.0.0-20230116080936-b3d5f29df3c3/feed.go:189 +0x684
github.com/VirusTotal/vt-go.(*Feed).retrieve(0xc000410e00)
        /root/go/pkg/mod/github.com/!virus!total/vt-go@v0.0.0-20230116080936-b3d5f29df3c3/feed.go:227 +0xaa
created by github.com/VirusTotal/vt-go.(*Client).NewFeed
        /root/go/pkg/mod/github.com/!virus!total/vt-go@v0.0.0-20230116080936-b3d5f29df3c3/feed.go:126 +0x22a

I analyzed this problem, bug arises from the error return of parseResponse.

This 400 resp'Content-Type is application/json,but the error used gzip, and then returned a nil Response.

use any time of the current package which large than (T-59m) can reproduce this problem