Assignment to entry in nil map in ServiceClient.Request #2798
Description
The code writes to MoreHeaders without initializing it. The actual initialization happens in Get/Post/etc, so if you use Request directly, you can get:
panic: assignment to entry in nil map
goroutine 1 [running]:
github.com/gophercloud/gophercloud.(*ServiceClient).Request(0xc00010fa90, {0x6efecb, 0x3}, {0xc00001e100, 0x1a}, 0xc?)
/home/dtantsur/gophercloud/service_client.go:150 +0x147
github.com/gophercloud/gophercloud/openstack/utils.GetSupportedMicroversions({0xc00013c000, {0xc00001e100, 0x1a}, {0x0, 0x0}, {0x6f117e, 0x9}, {0x0, 0x0}, 0xc00002ac90})
/home/dtantsur/gophercloud/openstack/utils/choose_version.go:130 +0xd1
main.main()
/home/dtantsur/gophercloud/main/main.go:26 +0x98